Regarding equilibrium potential (mammalian spinal motor neurons)

Equilibrium potential of potassium is +90 mV

The resting membrane potential is 70 mV identical to that of Ecl

Equilibrium potential of potassium is +90 mV

Increases in external sodium concentrations decrease the resting membrane potential

Equilibrium potential of sodium is 60 mV

Na+K+ ATPase pumps 2 sodium out of cell for every 3 potassium it pumps in

Which statement about blood flow is FALSE?

Poiseville s Law predicts the effects of pressure and resistance on cardiac output

cardiac output = stroke volume x heart rate

the volume of blood pumped through the lungs equals the volume entering the heart

Poiseville s Law predicts the effects of pressure and resistance on cardiac output

the resistance of the systemic circulation is 5 to 10 times the pulmonary vascular resistance

with constant pressure, a vessel with radius 2X has 16 times the flow of vessel with radius X

Regarding haemodynamic principles, which statement is FALSE?

an increase in total peripheral resistance leads to increased arterial volume and BP

viscosity of blood with haematocrit of 40 is three times that of water

arterial blood volume is 10-15% total volume

elastance measures a vessel s stiffness or recoil

aging causes increased elastance and therefore decrease in resting (unstressed) arterial volume

an increase in total peripheral resistance leads to increased arterial volume and BP

Which statement about factors affecting blood pressure is FALSE? Factors that increase blood pressure are:

pressure rises in increased cardiac output until the amount entering the arterial system equals the amount leaving

increased total peripheral resistance

Unmyelinated neurons:

do not have Schwann cells associated with them

constitute most of the cell population in the human central nervous system

Plasma lipids and lipid transport:

chylomicron remnants travel from the intestine within lymphatic fluid in the thoracic duct

apoprotein B166 and apoprotein C occurs in chylomicrons

lecithin cholesterol acyltrasferase is responsible for transferring cholesterol esters from HDL to

chylomicron remnants travel from the intestine within lymphatic fluid in the thoracic duct

one half of all LDL molecules is taken up by macrophages and other cells by means other than the LDL receptor

absorbs most of the filtered sodium ions in the presence of aldosterone

absorbs glucose in the normal state

absorbs most of the filtered water in the presence of ADH

secretes hydrogen via secondary active transport

is almost entirely impermeable to urea

there are a greater number of juxtamedullary nephrons than cortical

all sections are lined with cuboidal epithelial cells with luminal microvilli

the thick loop of Henle rises to lie adjacent to its glomerulus

there are a greater number of juxtamedullary nephrons than cortical

the lacis cells of the juxtaglomerular apparatus secrete renin

In skeletal muscle relaxation:

there is increase Na+ and K+ conduction in the end plate membranes

there is a spread of depolarisation along T tubules

there is increase Na+ and K+ conduction in the end plate membranes

a resting membrane potential of -65mV is finally reached

Which of the following statements regarding renal tubular glucose absorption is INCORRECT?

example of secondary active transport

binds to SGLT-2 in luminal membrane

example of secondary active transport

transported out of luminal cell by GLUT-2

about 100% reabsorption in proximal tubule if less than transport maximum

With regard to skeletal muscle, which is INCORRECT?

the Z line lies within the I band

the terminal cisterns of sarcoplasmic reticulum lie in contact with T tubules

the T tubules surround the muscle at its Z lines

the Z line lies within the I band

the M line is due to a central bulge in each of the thick filaments

the area between two adjacent Z lines is called a sarcomere

Regarding the physical characteristics of the circulation:

the arterial system contains the greatest volume of blood at any given time

arterioles have a strong muscular wall but can close completely

the arterial system contains the greatest volume of blood at any given time

the aorta has a greater total cross sectional area than the venae cavae

velocity is directly proportional to the cross sectional area of the blood vessel

Reynold s number represents a measure of laminar blood flow

Which is NOT correct about reflex mechanisms acting on the circulation?

the Bainbridge reflex causes increase in heart rate

the baroreceptors in the carotid bodies are stimulated when blood pressure increases

the Bainbridge reflex causes increase in heart rate

the Cushing reflex is a special central nervous system ischaemic response resulting from increased intracranial pressure

the maximum firing per change in pressure of the carotid baroreceptors occurs at a mean arterial pressure of 90mmHg

the glossopharyngeal nerve is involved in baroreceptor reflex system

Regarding volumes in each compartment, which is FALSE?

50% in venous system (systemic)

Regarding pressures, which is FALSE?

static pressure does not include kinetic energy

lateral (static) pressure is reduced but prolonged by elastic arteries

static pressure increases with gravitation (hydrostatic) pressure increases

static pressure does not include kinetic energy

greater resistance to flow through a segment of circulation leads to greater loss of energy through that segment

kinetic energy becomes more significant in a narrowed segment and converts back to potential energy when the tube widens

Regarding body water, which is FALSE?

of extracellular fluid, 25% is vascular, 75% extravascular

1/3 total body weight is extra and 2/3 intra cellular

plasma is 8% and total blood 10%, of body weight

of extracellular fluid, 25% is vascular, 75% extravascular

interstitial fluid is 15% of body weight

Regarding flow, which is FALSE?

if radius of a vessel is halved, the flow may be reduced to 1/16th of previous flow

flow is proportional to pressure gradient

flow is inversely proportional to resistance

Poiseville s Law relates flow to pressure gradient and factors that influence resistance

Poiseville Law demonstrates that resistance to flow is largely determined by viscosity and length of tube and radius x 4

if radius of a vessel is halved, the flow may be reduced to 1/16th of previous flow

Na+ / K+ ATPase pump which is FALSE?

it is an example of primary active transport

it is important in maintaining cell volume

plays a major role in secondary active transport

it is the main factor which determine the resting membrane potential

it is an example of primary active transport

The Na+ K+ ATPase pump:

is only found in muscle and nervous tissue

utilises ATP to pump out 2 Na+ ions for every 3 K+ ions

activity is altered by insulin, aldosterone and thyroid hormones

is only found in muscle and nervous tissue

ATP binds to the subunit causing a protein configuration change

is a II amino acid residue mainly found in the liver

is a polypeptide found in the intestine and nervous tissue

is a II amino acid residue mainly found in the liver

is not involved in the neuroendocrine system

Total lung capacity is equal to:

vital capacity + functional residual capacity

functional residual capacity + tidal volume

vital capacity + residual volume

Increased lung compliance is associated with:

increasing pulmonary venous pressure

low lung volumes associated with hypoventilation

Regarding the elastic properties of the lung:

pressure generated in an alveolus equals 4T/R

the lung volume at any given pressure during inflation is larger than during deflation

the area under the pressure-volume curve is known as the compliance

surface tension is the force acting across an imaginary line in the surface of the liquid

pressure generated in an alveolus equals 4T/R

surfactant, produced by Type I alveolar cells, reduces surface tension in alveoli

Metabolic functions of the lung include all of the following EXCEPT:

metabolism of arachidonic acid metabolises

The effects of hyperthyroidism on the cardiovascular system include all of the following EXCEPT:

increased expression of MHC isoforms in cardiac muscle

increased catecholamine plasma levels

increased affinity of receptors

vasodilation of peripheral vessels

Signs and effects of hyperparathyroidism include all EXCEPT:

Chvostek s and Trousseau s signs

Regarding atrial natriuretic peptide, which statement is INCORRECT?

it is secreted by heart, lung and brain

cardiac innervation is not required for secretion to occur

its action is terminated by receptor-mediated endocytosis

its filtration fraction is decreased

it is secreted by heart, lung and brain

glucocorticoids increase its secretion

Regarding noradrenergic stimulation:

elevates free fatty acid levels

increases blood flow to the skin

increases thresholds in the reticular formation

elevates free fatty acid levels

Regarding red blood cells, all are true EXCEPT:

G6PD deficiency increases red cell susceptibility to lysis by drugs and infection

erythropoiesis is stimulated by anaemia and hypoxia

after splenectomy, malaria has a higher mortality

normal adult haemoglobin is designated 2 2

about 5% of adult haemoglobin is haemoglobin A2 ( 2 2)

G6PD deficiency increases red cell susceptibility to lysis by drugs and infection

Regarding cholinergic stimulation:

relaxes bronchial smooth muscle

causes amylase secretion from salivary glands

decreases secretion from pancreatic ?????

has no effect on renal arterioles

relaxes bronchial smooth muscle

As a percentage of total blood volume, which of the following values are CORRECT?

20% is in the systemic arterioles and capillaries

40% is in the pulmonary circulation

13% is in the systemic arteries

20% is in the systemic arterioles and capillaries

neurons connecting vestibular nuclei with the vomiting centre

secretory granules in the posterior pituitary

neurons connecting vestibular nuclei with the vomiting centre

vesicles containing ACTH, TSH, GH, FSH, CH and PRL

Which statement regarding hyperbaric oxygen therapy is INCORRECT?

gas around the body is normal air compressed to the same high pressure

males eliminate carboxy haemoglobin faster than females

gas around the body is normal air compressed to the same high pressure

it produces marked increases in dissolved oxygen in the blood

oxygen is administered at up to 3 atmospheres pressure

toxicity includes optic neuritis

Regarding H+ renal excretion:

the distal convoluted tubule brush border contains carbonic anhydrase

H+ secretion occurs in all segments of the nephrons

H+ + NH3 NH4+ is the most significant tubular buffering reaction

CO2 is recycled / resorbed in the PCT to allow enhanced acid secretion

697 + Mcqs in Physiology in Biology Page 7 McqOptions

301.	Regarding equilibrium potential (mammalian spinal motor neurons)
A.	The resting membrane potential is 70 mV identical to that of Ecl
B.	Equilibrium potential of potassium is +90 mV
C.	Increases in external sodium concentrations decrease the resting membrane potential
D.	Equilibrium potential of sodium is 60 mV
E.	Na+K+ ATPase pumps 2 sodium out of cell for every 3 potassium it pumps in
Answer» B. Equilibrium potential of potassium is +90 mV

Discussion

302.	The following are NOT energy sources of muscle:
A.	phosphorylcreatine
B.	fatty acids
C.	glucose
D.	glycogen
E.	creatine
Answer» F.

Discussion

303.	Which statement about blood flow is FALSE?
A.	cardiac output = stroke volume x heart rate
B.	the volume of blood pumped through the lungs equals the volume entering the heart
C.	Poiseville s Law predicts the effects of pressure and resistance on cardiac output
D.	the resistance of the systemic circulation is 5 to 10 times the pulmonary vascular resistance
E.	with constant pressure, a vessel with radius 2X has 16 times the flow of vessel with radius X
Answer» C. Poiseville s Law predicts the effects of pressure and resistance on cardiac output

Discussion

304.	Regarding haemodynamic principles, which statement is FALSE?
A.	viscosity of blood with haematocrit of 40 is three times that of water
B.	arterial blood volume is 10-15% total volume
C.	elastance measures a vessel s stiffness or recoil
D.	aging causes increased elastance and therefore decrease in resting (unstressed) arterial volume
E.	an increase in total peripheral resistance leads to increased arterial volume and BP
Answer» E. an increase in total peripheral resistance leads to increased arterial volume and BP

Discussion

305.	On which of the following does aldosterone exert its greatest effect?
A.	glomerulus
B.	proximal tubule
C.	thin portion of loop of Henle
D.	thick portion of look of Henle
E.	cortical collecting system
Answer» F.

Discussion

306.	Which statement about factors affecting blood pressure is FALSE? Factors that increase blood pressure are:
A.	increased heart rate
B.	increased blood volume
C.	pressure rises in increased cardiac output until the amount entering the arterial system equals the amount leaving
D.	increased total peripheral resistance
E.	increased end systolic volume
Answer» F.

Discussion

307.	Unmyelinated neurons:
A.	do not have Schwann cells associated with them
B.	display salutatory conduction
C.	constitute most of the cell population in the human central nervous system
D.	do not occur in humans
E.	none of the above are true
Answer» F.

Discussion

308.	Which of the following is NOT synthesised in post-ganglionic sympathetic neurons:
A.	L-dopa
B.	dopamine
C.	noradrenaline
D.	adrenaline
E.	acetylcholine
Answer» D. adrenaline

Discussion

309.	Plasma lipids and lipid transport:
A.	apoprotein B48 occurs in VLDL
B.	apoprotein B166 and apoprotein C occurs in chylomicrons
C.	lecithin cholesterol acyltrasferase is responsible for transferring cholesterol esters from HDL to
D.	chylomicron remnants travel from the intestine within lymphatic fluid in the thoracic duct
E.	one half of all LDL molecules is taken up by macrophages and other cells by means other than the LDL receptor
Answer» D. chylomicron remnants travel from the intestine within lymphatic fluid in the thoracic duct

Discussion

310.	In which body compartment is the bicarb buffering system least important?
A.	intracellular
B.	interstitial
C.	CSF
D.	blood
E.	collecting duct
Answer» B. interstitial

Discussion

311.	The distal tubule:
A.	absorbs most of the filtered sodium ions in the presence of aldosterone
B.	absorbs glucose in the normal state
C.	absorbs most of the filtered water in the presence of ADH
D.	secretes hydrogen via secondary active transport
E.	is almost entirely impermeable to urea
Answer» F.

Discussion

312.	The renal tubule:
A.	all sections are lined with cuboidal epithelial cells with luminal microvilli
B.	the thick loop of Henle rises to lie adjacent to its glomerulus
C.	there are a greater number of juxtamedullary nephrons than cortical
D.	the lacis cells of the juxtaglomerular apparatus secrete renin
Answer» C. there are a greater number of juxtamedullary nephrons than cortical

Discussion

313.	Which of the following does NOT increase renal tubular sodium reabsorption?
A.	cortisol
B.	oestrogen
C.	growth hormone
D.	insulin
E.	glucagon
Answer» F.

Discussion

314.	In skeletal muscle relaxation:
A.	there is a spread of depolarisation along T tubules
B.	Ca2+ is released from troponin
C.	there is increase Na+ and K+ conduction in the end plate membranes
D.	a resting membrane potential of -65mV is finally reached
E.	Mg2+ has a crucial role
Answer» C. there is increase Na+ and K+ conduction in the end plate membranes

Discussion

315.	Which of the following statements regarding renal tubular glucose absorption is INCORRECT?
A.	binds to SGLT-2 in luminal membrane
B.	example of secondary active transport
C.	transported out of luminal cell by GLUT-2
D.	about 100% reabsorption in proximal tubule if less than transport maximum
E.	linked to sodium reabsorption
Answer» B. example of secondary active transport

Discussion

316.	With regard to skeletal muscle, which is INCORRECT?
A.	the terminal cisterns of sarcoplasmic reticulum lie in contact with T tubules
B.	the T tubules surround the muscle at its Z lines
C.	the Z line lies within the I band
D.	the M line is due to a central bulge in each of the thick filaments
E.	the area between two adjacent Z lines is called a sarcomere
Answer» C. the Z line lies within the I band

Discussion

317.	Which of the following is an example of a low energy phosphate compound:
A.	creatine phosphate
B.	UTP
C.	acetyl CoA
D.	glucose-6 phosphate
E.	ATP
Answer» E. ATP

Discussion

318.	Which glucose transporter is responsible for insulin-mediated glucose uptake in striated muscle and adipose tissue?
A.	glut 1
B.	glut 2
C.	glut 3
D.	glut 4
E.	glut 5
Answer» E. glut 5

Discussion

319.	Regarding the physical characteristics of the circulation:
A.	arterioles have a strong muscular wall but can close completely
B.	the arterial system contains the greatest volume of blood at any given time
C.	the aorta has a greater total cross sectional area than the venae cavae
D.	velocity is directly proportional to the cross sectional area of the blood vessel
E.	Reynold s number represents a measure of laminar blood flow
Answer» B. the arterial system contains the greatest volume of blood at any given time

Discussion

320.	Which is NOT correct about reflex mechanisms acting on the circulation?
A.	the baroreceptors in the carotid bodies are stimulated when blood pressure increases
B.	the Bainbridge reflex causes increase in heart rate
C.	the Cushing reflex is a special central nervous system ischaemic response resulting from increased intracranial pressure
D.	the maximum firing per change in pressure of the carotid baroreceptors occurs at a mean arterial pressure of 90mmHg
E.	the glossopharyngeal nerve is involved in baroreceptor reflex system
Answer» B. the Bainbridge reflex causes increase in heart rate

Discussion

321.	Regarding volumes in each compartment, which is FALSE?
A.	3% in LV and aorta
B.	15% in arterial system
C.	7% in capillaries
D.	50% in venous system (systemic)
E.	40% in pulmonary circulation
Answer» F.

Discussion

322.	Regarding pressures, which is FALSE?
A.	lateral (static) pressure is reduced but prolonged by elastic arteries
B.	static pressure increases with gravitation (hydrostatic) pressure increases
C.	static pressure does not include kinetic energy
D.	greater resistance to flow through a segment of circulation leads to greater loss of energy through that segment
E.	kinetic energy becomes more significant in a narrowed segment and converts back to potential energy when the tube widens
Answer» C. static pressure does not include kinetic energy

Discussion

323.	Regarding body water, which is FALSE?
A.	1/3 total body weight is extra and 2/3 intra cellular
B.	60% of body weight is water
C.	plasma is 8% and total blood 10%, of body weight
D.	of extracellular fluid, 25% is vascular, 75% extravascular
E.	interstitial fluid is 15% of body weight
Answer» D. of extracellular fluid, 25% is vascular, 75% extravascular

Discussion

324.	Regarding flow, which is FALSE?
A.	flow is proportional to pressure gradient
B.	flow is inversely proportional to resistance
C.	Poiseville s Law relates flow to pressure gradient and factors that influence resistance
D.	Poiseville Law demonstrates that resistance to flow is largely determined by viscosity and length of tube and radius x 4
E.	if radius of a vessel is halved, the flow may be reduced to 1/16th of previous flow
Answer» E. if radius of a vessel is halved, the flow may be reduced to 1/16th of previous flow

Discussion

325.	Which substance is 60 times more concentrated in urine than in plasma?
A.	glucose
B.	creatinine
C.	sodium
D.	urea
Answer» E.

Discussion

326.	The molecular mass of a substance is expressed in:
A.	moles
B.	Daltons
C.	equivalents
D.	osmoles
E.	grams
Answer» C. equivalents

Discussion

327.	Trace elements believed essential to life include all EXCEPT:
A.	arsenic
B.	cyanide
C.	cobalt
D.	silicon
E.	nickel
Answer» C. cobalt

Discussion

328.	Na+ / K+ ATPase pump which is FALSE?
A.	it is electrogenic in nature
B.	it is important in maintaining cell volume
C.	plays a major role in secondary active transport
D.	it is the main factor which determine the resting membrane potential
E.	it is an example of primary active transport
Answer» E. it is an example of primary active transport

Discussion

329.	Na+ -K+ -ATPase is an example of a/an:
A.	symport
B.	uniport
C.	biport
D.	antiport
E.	airport
Answer» E. airport

Discussion

330.	The Na+ K+ ATPase pump:
A.	utilises ATP to pump out 2 Na+ ions for every 3 K+ ions
B.	activity is altered by insulin, aldosterone and thyroid hormones
C.	is only found in muscle and nervous tissue
D.	is made of , , and subunits
E.	ATP binds to the subunit causing a protein configuration change
Answer» C. is only found in muscle and nervous tissue

Discussion

331.	Substance P:
A.	is a carbohydrate
B.	is a polypeptide found in the intestine and nervous tissue
C.	is a II amino acid residue mainly found in the liver
D.	is not involved in the neuroendocrine system
E.	is a lipid
Answer» C. is a II amino acid residue mainly found in the liver

Discussion

332.	Total lung capacity is equal to:
A.	vital capacity + tidal volume
B.	vital capacity + functional residual capacity
C.	tidal volume + residual volume
D.	functional residual capacity + tidal volume
E.	vital capacity + residual volume
Answer» F.

Discussion

333.	Lung compliance increases with:
A.	asthma
B.	alveolar oedema
C.	pulmonary hypertension
D.	atelectasis
E.	pulmonary fibrosis
Answer» B. alveolar oedema

Discussion

334.	Increased lung compliance is associated with:
A.	increasing age
B.	increasing pulmonary venous pressure
C.	high expanding pressures
D.	interstitial fibrosis
E.	low lung volumes associated with hypoventilation
Answer» B. increasing pulmonary venous pressure

Discussion

335.	Regarding the elastic properties of the lung:
A.	the lung volume at any given pressure during inflation is larger than during deflation
B.	the area under the pressure-volume curve is known as the compliance
C.	surface tension is the force acting across an imaginary line in the surface of the liquid
D.	pressure generated in an alveolus equals 4T/R
E.	surfactant, produced by Type I alveolar cells, reduces surface tension in alveoli
Answer» D. pressure generated in an alveolus equals 4T/R

Discussion

336.	Metabolic functions of the lung include all of the following EXCEPT:
A.	conversion of AI to AII by ACE
B.	metabolism of AII
C.	inactivation of bradykinin
D.	removal of serotonin
E.	metabolism of arachidonic acid metabolises
Answer» C. inactivation of bradykinin

Discussion

337.	All of the following shift the Hb dissociation curve to the right during exercise EXCEPT:
A.	increased 2,3 DPG
B.	increased pCO2
C.	increased temperature
D.	decreased pO2
E.	increased H+ concentration
Answer» E. increased H+ concentration

Discussion

338.	The effects of hyperthyroidism on the cardiovascular system include all of the following EXCEPT:
A.	increased expression of MHC isoforms in cardiac muscle
B.	increased catecholamine plasma levels
C.	increased number of receptors
D.	increased affinity of receptors
E.	vasodilation of peripheral vessels
Answer» C. increased number of receptors

Discussion

339.	Signs and effects of hyperparathyroidism include all EXCEPT:
A.	renal stones
B.	demineralization of bones
C.	Chvostek s and Trousseau s signs
D.	hypercalcaemia
E.	hypophosphataemia
Answer» D. hypercalcaemia

Discussion

340.	Regarding atrial natriuretic peptide, which statement is INCORRECT?
A.	cardiac innervation is not required for secretion to occur
B.	its action is terminated by receptor-mediated endocytosis
C.	its filtration fraction is decreased
D.	it is secreted by heart, lung and brain
E.	glucocorticoids increase its secretion
Answer» D. it is secreted by heart, lung and brain

Discussion

341.	Regarding noradrenergic stimulation:
A.	miosis occurs
B.	increases blood flow to the skin
C.	increases thresholds in the reticular formation
D.	causes erection in males
E.	elevates free fatty acid levels
Answer» E. elevates free fatty acid levels

Discussion

342.	Which decreases Na+ -K+ -ATPase pump activity?
A.	thyroid hormones
B.	dopamine
C.	G-actin
D.	intracellular sodium
E.	insulin
Answer» C. G-actin

Discussion

343.	Regarding red blood cells, all are true EXCEPT:
A.	erythropoiesis is stimulated by anaemia and hypoxia
B.	after splenectomy, malaria has a higher mortality
C.	normal adult haemoglobin is designated 2 2
D.	about 5% of adult haemoglobin is haemoglobin A2 ( 2 2)
E.	G6PD deficiency increases red cell susceptibility to lysis by drugs and infection
Answer» E. G6PD deficiency increases red cell susceptibility to lysis by drugs and infection

Discussion

344.	Regarding cholinergic stimulation:
A.	causes amylase secretion from salivary glands
B.	decreases secretion from pancreatic ?????
C.	relaxes the gallbladder
D.	has no effect on renal arterioles
E.	relaxes bronchial smooth muscle
Answer» E. relaxes bronchial smooth muscle

Discussion

345.	Which volume of distribution is evaluated with which substance?
A.	plasma D2O
B.	RBC volume 51Cr
C.	ECF Evans Blue
D.	Interstitial fluid Inulin
E.	ICF mannitol
Answer» C. ECF Evans Blue

Discussion

346.	As a percentage of total blood volume, which of the following values are CORRECT?
A.	40% is in the pulmonary circulation
B.	13% is in the systemic arteries
C.	20% is in the systemic arterioles and capillaries
D.	30% is in the veins
E.	none of the above are correct
Answer» C. 20% is in the systemic arterioles and capillaries

Discussion

347.	Herring bodies are:
A.	nuclei of the hypothalamus
B.	secretory granules in the posterior pituitary
C.	circumventricular organs
D.	neurons connecting vestibular nuclei with the vomiting centre
E.	vesicles containing ACTH, TSH, GH, FSH, CH and PRL
Answer» D. neurons connecting vestibular nuclei with the vomiting centre

Discussion

348.	Which pattern of laboratory findings in the tale below is most consistent with a diagnosis of diabetes insipidis? 24 Hr Urine Volume Ketones Glucose Protein
A.	4.0 + 0 0
B.	6.2 2+ 4+ 0
C.	1.6 0 0 4+
D.	6.4 0 0 0
E.	5.0 0 0 3+
Answer» E. 5.0 0 0 3+

Discussion

349.	Which statement regarding hyperbaric oxygen therapy is INCORRECT?
A.	males eliminate carboxy haemoglobin faster than females
B.	gas around the body is normal air compressed to the same high pressure
C.	it produces marked increases in dissolved oxygen in the blood
D.	oxygen is administered at up to 3 atmospheres pressure
E.	toxicity includes optic neuritis
Answer» B. gas around the body is normal air compressed to the same high pressure

Discussion

350.	Regarding H+ renal excretion:
A.	the distal convoluted tubule brush border contains carbonic anhydrase
B.	H+ secretion occurs in all segments of the nephrons
C.	H+ + NH3 NH4+ is the most significant tubular buffering reaction
D.	CO2 is recycled / resorbed in the PCT to allow enhanced acid secretion
E.	collecting duct
Answer» E. collecting duct

Discussion

Explore topic-wise MCQs in Biology.

Regarding equilibrium potential (mammalian spinal motor neurons)

The following are NOT energy sources of muscle:

Which statement about blood flow is FALSE?

Regarding haemodynamic principles, which statement is FALSE?

On which of the following does aldosterone exert its greatest effect?

Which statement about factors affecting blood pressure is FALSE? Factors that increase blood pressure are:

Unmyelinated neurons:

Which of the following is NOT synthesised in post-ganglionic sympathetic neurons:

Plasma lipids and lipid transport:

In which body compartment is the bicarb buffering system least important?

The distal tubule:

The renal tubule:

Which of the following does NOT increase renal tubular sodium reabsorption?

In skeletal muscle relaxation:

Which of the following statements regarding renal tubular glucose absorption is INCORRECT?

With regard to skeletal muscle, which is INCORRECT?

Which of the following is an example of a low energy phosphate compound:

Which glucose transporter is responsible for insulin-mediated glucose uptake in striated muscle and adipose tissue?

Regarding the physical characteristics of the circulation:

Which is NOT correct about reflex mechanisms acting on the circulation?

Regarding volumes in each compartment, which is FALSE?

Regarding pressures, which is FALSE?

Regarding body water, which is FALSE?

Regarding flow, which is FALSE?

Which substance is 60 times more concentrated in urine than in plasma?

The molecular mass of a substance is expressed in:

Trace elements believed essential to life include all EXCEPT:

Na+ / K+ ATPase pump which is FALSE?

Na+ -K+ -ATPase is an example of a/an:

The Na+ K+ ATPase pump:

Substance P:

Total lung capacity is equal to:

Lung compliance increases with:

Increased lung compliance is associated with:

Regarding the elastic properties of the lung:

Metabolic functions of the lung include all of the following EXCEPT:

All of the following shift the Hb dissociation curve to the right during exercise EXCEPT:

The effects of hyperthyroidism on the cardiovascular system include all of the following EXCEPT:

Signs and effects of hyperparathyroidism include all EXCEPT:

Regarding atrial natriuretic peptide, which statement is INCORRECT?

Regarding noradrenergic stimulation:

Which decreases Na+ -K+ -ATPase pump activity?

Regarding red blood cells, all are true EXCEPT:

Regarding cholinergic stimulation:

Which volume of distribution is evaluated with which substance?

As a percentage of total blood volume, which of the following values are CORRECT?

Herring bodies are:

Which pattern of laboratory findings in the tale below is most consistent with a diagnosis of diabetes insipidis? 24 Hr Urine Volume Ketones Glucose Protein

Which statement regarding hyperbaric oxygen therapy is INCORRECT?

Regarding H+ renal excretion: