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MCQOPTIONS
This section includes 14620 Mcqs, each offering curated multiple-choice questions to sharpen your NEET knowledge and support exam preparation. Choose a topic below to get started.
| 1801. |
In an old science fiction movie, the hero tried to drown a giant ant by holding its head under water. Would this work? Why? |
| A. | Yes, Ants use lungs to breathe much as we do. |
| B. | Yes, The skin surface, covered with water, could not get \[{{O}_{2}}\] from the air. |
| C. | No, Ants use gills for respiration, like crabs do. |
| D. | No, Ants breathe through holes in the sides of their bodies. |
| Answer» E. | |
| 1802. |
The breathing rate gets increased by the increase in the content of: |
| A. | Nitrogen |
| B. | Oxygen |
| C. | Carbon dioxide |
| D. | Carbon monoxide |
| Answer» D. Carbon monoxide | |
| 1803. |
Gas exchange between maternal and foetal blood takes place in the placenta. Foetal and adult haemoglobin differ slightly in composition, and their dissociation curves are different so that oxygen can be transferred from maternal blood to foetal blood. If curve III represents the dissociation curve of adult haemoglobin, which curve would represent foetal haemoglobin? (Hint: Must foetal haemoglobin have a higher or lower affinity for oxygen than maternal haemoglobin has?) |
| A. | I |
| B. | II |
| C. | III |
| D. | IV |
| Answer» C. III | |
| 1804. |
Which of the following statements are true/ false? (i) The blood transports \[C{{O}_{2}}\] comparatively easily because of its higher solubility. (ii) Approximately 8.9% of \[C{{O}_{2}}\] is transported being dissolved in the plasma of blood. (iii) The carbon dioxide produced by the tissues, diffuses passively into the blood stream and passes into red blood corpsucles and react with water to form\[{{H}_{2}}C{{O}_{3}}\]. (iv) The oxyhaemoglobin (\[Hb{{O}_{2}}\]) of the erythrocytes is basic. (v) The chloride ions diffuse from plasma into the erythrocytes to maintain ionic balance. |
| A. | (i), (iii) and (v) are true, (ii) and (iv) are false. |
| B. | (i), (iii) and (v) are false, (ii) and (iv) are true. |
| C. | (i), (ii) and (iv) are true, (iii) and (v) are false. |
| D. | (i), (ii) and (iv) are false, (iii) and (v) are true. |
| Answer» B. (i), (iii) and (v) are false, (ii) and (iv) are true. | |
| 1805. |
When the carbon dioxide concentration in blood increases, the rate of breathing will: |
| A. | Remain unaffected |
| B. | Decrease |
| C. | Stop |
| D. | Increase |
| Answer» E. | |
| 1806. |
At rest, most people require an alveolar ventilation for about 4 L/minute. Suppose an emphysema victim with a tidal volume of 0.5 L has suffered alveolar damage that has produced a respiratory dead space of 0.3 L, what will be that person's frequency of breathing at rest? |
| A. | 5 breaths/min |
| B. | 8 breaths/min |
| C. | 20 breaths/min |
| D. | 50 breaths/min |
| Answer» D. 50 breaths/min | |
| 1807. |
Which of the following gases makes the most stable combination with the haemoglobin of RBCs? |
| A. | \[C{{O}_{2}}\] |
| B. | CO |
| C. | \[{{O}_{2}}\] |
| D. | N |
| Answer» C. \[{{O}_{2}}\] | |
| 1808. |
The Bohr shift describes: |
| A. | The outward movement of \[C{{l}^{-}}\] from the blood cell in exchange for \[HC{{O}_{3}}^{-}\] moving into the cell. |
| B. | The leftward shift of the entire oxygen equilibrium curve when temperature rises. |
| C. | The rightward shift of the entire oxygen equilibrium curve when pH rises. |
| D. | The rightward shift of the entire oxygen equilibrium curve when pH falls. |
| Answer» E. | |
| 1809. |
During oxygen transport, the oxyhaemoglobin at the tissue level liberates oxygen to the cells because in tissue: |
| A. | \[{{O}_{2}}\] concentration is high and \[C{{O}_{2}}\] is low. |
| B. | \[{{O}_{2}}\] concentration is low and \[C{{O}_{2}}\] is high. |
| C. | \[{{O}_{2}}\] tension is high and \[C{{O}_{2}}\] tension is low. |
| D. | \[{{O}_{2}}\] tension is low and \[C{{O}_{2}}\] tension is high. |
| Answer» E. | |
| 1810. |
Arrange the given steps of respiration in the sequence of event they occur. Choose the correct options given below. (i) Diffusion of gases, \[{{O}_{2}}\] and \[C{{O}_{2}}\] across the alveolar membrane. (ii) Transport of gases by the blood. (iii) Utilisation of \[{{O}_{2}}\] by the cells for catabolic reactions and the resultant releases of\[C{{O}_{2}}\]. (iv) Pulmonary ventilation by which atmospheric air is drawn in and \[C{{O}_{2}}\] rich alveolar air is released out. (v) Diffusion of \[{{O}_{2}}\] and \[C{{O}_{2}}\] between the blood and tissue. |
| A. | (iii), (v), (ii), (i), (iv) |
| B. | (iii), (ii), (v), (i), (iv) |
| C. | (v), (iv), (iii), (ii), (i) |
| D. | (i), (ii), (iii), (iv), (v) |
| Answer» B. (iii), (ii), (v), (i), (iv) | |
| 1811. |
During \[C{{O}_{2}}\] transport, diffuses from erythrocytes to plasma and in turn upsets the ionic equilibrium momentary, in order to keep the ionic balance, and equal number of \[C{{l}^{-}}\] ions pass into the erythrocytes from plasma. This process is known as: |
| A. | Bicarbonate shift |
| B. | Carbonation |
| C. | Hamburger phenomenon |
| D. | Carbo-chlorosis |
| Answer» D. Carbo-chlorosis | |
| 1812. |
The impulse for voluntary (forced) breathing starts in: |
| A. | Medulla |
| B. | Vagus |
| C. | Cerebral hemisphere |
| D. | Spinal cord |
| Answer» D. Spinal cord | |
| 1813. |
Membrane separating air in pulmonary alveoli from blood capillaries is: |
| A. | Alveolar epithelium |
| B. | Cardiac epithelium |
| C. | Endothelium of blood capillaries |
| D. | Both [a] and [c] |
| Answer» E. | |
| 1814. |
Common feature of human and insect trachea is: |
| A. | Non-collapsible wall |
| B. | Supporting rings |
| C. | Ectodermal origin |
| D. | Endodermal origin |
| Answer» B. Supporting rings | |
| 1815. |
In expiration, diaphragm becomes: |
| A. | Flattened |
| B. | Contract |
| C. | Straightened |
| D. | Arched |
| Answer» E. | |
| 1816. |
Which fact suggests that most \[{{O}_{2}}\] is transported from lungs to the tissues combined with haemoglobin rather than dissolved in blood plasma? |
| A. | \[{{O}_{2}}\] -carrying capacity of whole blood is much higher than that of plasma and \[{{O}_{2}}\] content of blood leaving the lungs is greater than that of blood entering the lungs. |
| B. | Haemoglobin can combine with\[{{O}_{2}}\]. |
| C. | Oxyhaemoglobin can dissociate into haemoglobin and\[{{O}_{2}}\]. |
| D. | Increase in \[C{{O}_{2}}\]-concentration decreases the \[{{O}_{2}}\]-affinity of haemoglobin. |
| Answer» B. Haemoglobin can combine with\[{{O}_{2}}\]. | |
| 1817. |
A person receives a serious cut on the back of the neck that is deep enough to severely damage the brain stem in the lower medulla. The respiratory effect of this type of wound would likely be: |
| A. | Catastrophic and it might result in a complete cessation of breathing. |
| B. | To reduce respiration to an irregular rhythm. |
| C. | To shift the oxygen-binding curve of haemoglobin to the left. |
| D. | To stimulate the production of additional diphosphoglyceric acid. |
| Answer» B. To reduce respiration to an irregular rhythm. | |
| 1818. |
Match the disorders given in column-I with symptoms under column-II. Choose the answer which gives the correct combination of alphabets with numbers. Column-I Column-II A. Asthma I. Inflammation of nasal tract B. Bronchitis II. Spasm of bronchial muscles C. Rhinitis III. Fully blown out alveoli D. Emphysema IV. Inflammation of bronchi E. V. Cough with blood strained sputum |
| A. | A-IV, B-II, C-V, D-I |
| B. | A-V, B-III, C-II, D-I |
| C. | A-III, B-I, C-V, D-IV |
| D. | A-II, B-IV; C-I, D-III |
| Answer» E. | |
| 1819. |
After taking a long deep breath, we do not respire for some seconds due to: |
| A. | More \[C{{O}_{2}}\] in blood. |
| B. | More \[{{O}_{2}}\] in blood. |
| C. | Less \[C{{O}_{2}}\] in blood. |
| D. | Less \[{{O}_{2}}\] in blood, |
| Answer» D. Less \[{{O}_{2}}\] in blood, | |
| 1820. |
The graph shows dissociation curves for four respiratory pigments. |
| A. | Adult HaemoglobinHaemoglobin with high \[C{{O}_{2}}\]Foetal HaemoglobinAdult myoglobin1234 |
| B. | 2143 |
| C. | 3214 |
| D. | 3421 |
| Answer» E. | |
| 1821. |
Patients with chronic lung disease and difficulty breathing often adapt to the high concentration of \[C{{O}_{2}}\] in their blood. The breathing centres stop responding to \[C{{O}_{2}}\] level. If such a patient has difficulty in breathing, medical personnel are reluctant to give the patient pure oxygen. Based on what you know about control of breathing why do you think this is the case? |
| A. | The patient's body would use the oxygen to make even more\[C{{O}_{2}}\]. |
| B. | The oxygen would increase concentration of bicarbonate, altering pH. |
| C. | Increased oxygen in the blood might slow or stop breathing. |
| D. | The body is not used to the oxygen, and the patient would overdose. |
| Answer» D. The body is not used to the oxygen, and the patient would overdose. | |
| 1822. |
Forced deep breathing for a few minutes by a person at rest may be followed by a temporary cessation of breathing, because of: |
| A. | Too much \[{{O}_{2}}\] in blood. |
| B. | Too much \[C{{O}_{2}}\] in blood, |
| C. | Little \[C{{O}_{2}}\] in blood. |
| D. | Both too much \[{{O}_{2}}\] and very little \[C{{O}_{2}}\] in blood. |
| Answer» E. | |
| 1823. |
The alveoli of the lungs do not contain "air" because: |
| A. | We normally do not ventilate our lungs at a high enough rate. |
| B. | The lungs have too many alveoli to ventilate. |
| C. | There is "dead space" in the trachea and bronchi. |
| D. | The trachea and bronchi are too small in volume. |
| Answer» D. The trachea and bronchi are too small in volume. | |
| 1824. |
A biochemist mixed 10 drops of acid with 100 mL of water, and the pH dropped from 7.4 to 5.0. She, then mixed 10 drops of acid with 100 mL of blood. The pH dropped from 7.4 to 7.2. What is the reason for this difference? |
| A. | Blood is thicker than water. |
| B. | Blood is already very acidic, so the acid has less effect. |
| C. | Blood is saturated with oxygen; there is little room for acid. |
| D. | Blood contains buffers that reduce pH change. |
| Answer» E. | |
| 1825. |
Alveoli increase the surface area by: |
| A. | 10\[{{m}^{2}}\] |
| B. | 100\[{{m}^{2}}\] |
| C. | 150\[{{m}^{2}}\] |
| D. | 200\[{{m}^{2}}\] |
| Answer» C. 150\[{{m}^{2}}\] | |
| 1826. |
The covering of lungs is called: |
| A. | Pleura |
| B. | Pericardia |
| C. | Peritoneum |
| D. | Mediastinum |
| Answer» B. Pericardia | |
| 1827. |
If the thoracic wall of the lungs is punctured then: |
| A. | The lungs get inflated. |
| B. | The man dies as the lungs get collapsed. |
| C. | The breathing rate decreases. |
| D. | The breathing rate increases. |
| Answer» C. The breathing rate decreases. | |
| 1828. |
Although much \[C{{O}_{2}}\] is carried in blood, yet blood does not become acidic, because: |
| A. | It is absorbed by the leucoc |
| B. | Blood buffers play an important role in \[C{{O}_{2}}\] transport. |
| C. | It combines with water to form \[{{H}_{2}}C{{O}_{3}}\]which is neutralised by \[NaC{{O}_{3}}\]. |
| D. | it is continuously diffused through tissues and is not allowed to accumulate. |
| Answer» C. It combines with water to form \[{{H}_{2}}C{{O}_{3}}\]which is neutralised by \[NaC{{O}_{3}}\]. | |
| 1829. |
What would happen if human blood becomes acidic (low pH)? |
| A. | Oxygen-carying capacity of haemoglobin decreases. |
| B. | Oxygen-carrying capacity of haemoglobin increases. |
| C. | RBC count increases. |
| D. | RBC count decreases. |
| Answer» B. Oxygen-carrying capacity of haemoglobin increases. | |
| 1830. |
Hamburger phenomenon is also known as: |
| A. | Calcium shift |
| B. | Bohr effect |
| C. | Chloride shift |
| D. | \[N{{a}^{+}}-{{K}^{+}}\]pump |
| Answer» D. \[N{{a}^{+}}-{{K}^{+}}\]pump | |
| 1831. |
Left lung of human has: |
| A. | 2 lobes |
| B. | 4 lobes |
| C. | 3 lobes |
| D. | 5 lobes |
| Answer» B. 4 lobes | |
| 1832. |
The 'blue baby' syndrome results from: |
| A. | Methaemoglobin |
| B. | Excess of dissolved oxygen |
| C. | Excess of TDS (total dissolved solids) |
| D. | Excess of chloride |
| Answer» B. Excess of dissolved oxygen | |
| 1833. |
Voice in mammal is produced: |
| A. | By syrinx |
| B. | during inhalation |
| C. | By bronchus |
| D. | during exhalation |
| Answer» E. | |
| 1834. |
Which of the following statements sequences is correct to initiate inspiration? (i) The contraction of external intercoastal muscles raises the ribs and sternum. (ii) Volume of thorax increases in the dorsoventral axis. (iii) Increase in pulmonary volume. (iv) Intrapulmonary pressure decreases. (v) Volume of thorax increases in the anterior- posterior axis. |
| A. | (i), (ii), (iv), (v), (iii) |
| B. | (i), (ii), (iii), (iv), (v) |
| C. | (i), (ii), (iv), (iii), (v) |
| D. | (v), (i), (ii), (iii), (iv) |
| Answer» D. (v), (i), (ii), (iii), (iv) | |
| 1835. |
Total lungs capacity is approximately: |
| A. | 1200ml |
| B. | 2400ml |
| C. | 4000ml |
| D. | 5800ml |
| Answer» E. | |
| 1836. |
The tissue respiration refers to: |
| A. | Inspiration |
| B. | Expiration |
| C. | External respiration |
| D. | Internal respiration |
| Answer» E. | |
| 1837. |
Switch off centre for breathing lies in: |
| A. | Medulla oblongata |
| B. | Hypothalamus |
| C. | Pons |
| D. | Carotid bodies |
| Answer» D. Carotid bodies | |
| 1838. |
The function of nasal cavity and nasopharynx is to: |
| A. | Warm the inspired air. |
| B. | Moisten the inspired air. |
| C. | Filter out the dust particles from the inspired air. |
| D. | All of the above |
| Answer» E. | |
| 1839. |
Breathing with the help of ribs is more pronounced in: |
| A. | Males |
| B. | Females |
| C. | Pregnant females |
| D. | None of these |
| Answer» D. None of these | |
| 1840. |
Because of the relatively high altitude of Antonito, Colorado, the town has a normal barometric pressure of about 600 mm He rather than 760 mm Hg as at sea level. The partial pressure of oxygen in Antonito's air is approximately: |
| A. | 75 mmHg |
| B. | 126 mmHg |
| C. | 160 mm Hg |
| D. | 760 mm Hg |
| Answer» C. 160 mm Hg | |
| 1841. |
The alveoli contain specialised cells that secreted phospholipoprotein complex known a pulmonary surfactant. The function of pulmonary surfactant is: |
| A. | To provide some rigidity to the alveoli m prevent lung collapse. |
| B. | To decrease the surface tension of the alveoli, making it easier to expand them |
| C. | To facilitate the diffusion of \[{{O}_{2}}\] and \[C{{O}_{2}}\] by providing protein channels through which these gases flow. |
| D. | To provide a sticky surface upon which dust and microbes are trapped and disposed of |
| Answer» C. To facilitate the diffusion of \[{{O}_{2}}\] and \[C{{O}_{2}}\] by providing protein channels through which these gases flow. | |
| 1842. |
R.Q. is less than 1 for: |
| A. | Starch |
| B. | Organic acid |
| C. | Protein |
| D. | Carbohydrate |
| Answer» D. Carbohydrate | |
| 1843. |
Approximate amount of \[{{O}_{2}}\] in expired air is: |
| A. | 16% |
| B. | 0.046 |
| C. | 19% |
| D. | <1% |
| Answer» B. 0.046 | |
| 1844. |
Which of the following statement correctly defines Bohr effect? |
| A. | Rise in p50 with a decrease in \[C{{O}_{2}}\] cone. |
| B. | Rise in p50 with decrease in pH. |
| C. | Rise in p50 with increase in \[{{O}_{2}}\] |
| D. | Fall in p50 with decrease in pH. |
| Answer» C. Rise in p50 with increase in \[{{O}_{2}}\] | |
| 1845. |
The graph shows four dissociation curves. Which curve represents the oxygen dissociation curve for myoglobin? |
| A. | I |
| B. | II |
| C. | III |
| D. | IV |
| Answer» B. II | |
| 1846. |
Which of the following statement sequences is correct to initiate expiration? (i) Relaxation of external intercostal muscles and return of diaphragm and sternum to their normal position. (ii) Air expelled from lungs. (iii) Volume of thorax decreases. (iv) Intrapulmonary pressure increases. |
| A. | (i), (iii), (iv), (ii) |
| B. | (ii), (iv), (iii), (i) |
| C. | (iv), (iii), (ii), (i) |
| D. | (i),(ii), (iii), (iv) |
| Answer» B. (ii), (iv), (iii), (i) | |
| 1847. |
Partial pressure of oxygen in inspired and expired air is ....... and ....... mm of Hg. |
| A. | 100, 46 |
| B. | 158, 40 |
| C. | 158, 90 |
| D. | 100, 95 |
| Answer» C. 158, 90 | |
| 1848. |
Much developed larynx of human male is called: |
| A. | Aristole?s lantern |
| B. | Syrinx |
| C. | Adam's apple |
| D. | Muller's organ |
| Answer» D. Muller's organ | |
| 1849. |
Anaemia due to failure of maturation of RBC is: |
| A. | Von Kluger's disease |
| B. | Microcytic anaemia |
| C. | Normocytic anaemia |
| D. | Pernicious anaemia |
| Answer» E. | |
| 1850. |
The given diagram represents human heart with four chambers labelled as 1, 2, 3 & 4? Which labelled structure receives carbon dioxide rich blood from the body? |
| A. | 1-Left atrium |
| B. | 2-Left ventricle |
| C. | 3- Right atrium |
| D. | 4- Right ventricle |
| Answer» D. 4- Right ventricle | |