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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.
| 1851. |
A recording of the electrical activity of a patient's heart, shows that the atria are contracting regularly and normally, but every few beats the ventricles fail to contract. Which of the following is probably not functioning properly? |
| A. | AV node |
| B. | Semilunar valve |
| C. | Coronary artery |
| D. | Pacemaker |
| Answer» B. Semilunar valve | |
| 1852. |
Which one of the statement is correct with reference to the circulation of blood in a mammal? |
| A. | Left auricle receives oxygenated blood. |
| B. | Pulmonary artery carries oxygenated blood to the lungs. |
| C. | Blood from the lungs is returned to heart through 2-veins, one from each lung. |
| D. | None of the above |
| Answer» B. Pulmonary artery carries oxygenated blood to the lungs. | |
| 1853. |
What happens when the pacemaker is nonfunctional? |
| A. | Only the auricles will contract rhythmically. |
| B. | The cardiac muslces do not contract in a coordinated manner rhythmically. |
| C. | Only ventricles will contract rhythmically. |
| D. | Auricles and ventricles contract simultaneously. |
| Answer» C. Only ventricles will contract rhythmically. | |
| 1854. |
The left atrio-ventricular aperture in man is guarded by: |
| A. | Tricuspid valve |
| B. | Semilunar valve |
| C. | Bicuspid valve |
| D. | Sphincter valve |
| Answer» D. Sphincter valve | |
| 1855. |
Cardiac cycle in man takes about: |
| A. | 0.5 seconds |
| B. | 1.0 second |
| C. | 1.2 seconds |
| D. | 0.8 seconds |
| Answer» E. | |
| 1856. |
Which of the following is not one of the reasons that closed circulatory systems are more efficient than open circulatory systems? |
| A. | Closed systems rely exclusively on simple diffusion for transport, whereas open systems rely on pumping mechanisms. |
| B. | Transport within closed systems is more rapid than in open systems. |
| C. | Blood can easily be directed to specific areas in closed systems, but not in open systems. |
| D. | Closed systems operate better under higher pressure than do open systems. |
| Answer» B. Transport within closed systems is more rapid than in open systems. | |
| 1857. |
Which of the following correctly traces the electrical impulses that trigger each heartbeat? |
| A. | Ventricles-Pacemaker-AV node-Atria |
| B. | Pacemaker-AV node-Atria-Ventricles |
| C. | Atria-Pacemaker-AV node-Ventricles |
| D. | Pacemaker-Atria-AV node-Ventricles |
| Answer» E. | |
| 1858. |
Mitral valve in mammals guards the opening between: |
| A. | Left auricle and left-ventricle |
| B. | Pulmonary vein and left auricle |
| C. | Stomach and intestine |
| D. | Liver and spleen |
| Answer» B. Pulmonary vein and left auricle | |
| 1859. |
The heartbeat of a person increases at the time of an interview due to secretion of: |
| A. | Renin |
| B. | Adrenaline |
| C. | ADH |
| D. | ACTH |
| Answer» C. ADH | |
| 1860. |
Which one of the following will be the cardiac output (in litres per minute) of a heart that has a stroke volume of 0.07 litres and is beating at a rate of 90 per minute? |
| A. | 63.30 |
| B. | 63.00 |
| C. | 00.63 |
| D. | 6.3 |
| Answer» E. | |
| 1861. |
Tunica adventitia is the: |
| A. | Outermost fibrous layer of the artery. |
| B. | Middle vascular layer of the artery. |
| C. | Outermost covering of the stomach. |
| D. | Innermost layer of fine blood capillaries. |
| Answer» B. Middle vascular layer of the artery. | |
| 1862. |
If heart of a mammal is injected with 2% \[CaC{{l}_{2}}\] solutions, then: |
| A. | Heart beat will increase. |
| B. | Heart beat will first increase then decrease. |
| C. | Heart beat will stop. |
| D. | No effect |
| Answer» D. No effect | |
| 1863. |
Persons suffering from high blood pressure should take the following precaution to avoid excessive rise in their blood pressure: |
| A. | Sleep as much as possible |
| B. | Avoid standing |
| C. | Increase their weight |
| D. | Avoid emotional disturbances and excitement. |
| Answer» E. | |
| 1864. |
Identify the correct statements regarding the human blood. (i) It constitutes 30-35% of the total extracellular fluid. (ii) The volume of the blood in an adult is 5L. (iii) Glucose concentration in the blood is 50 mg/100 mL. (iv) Cholesterol concentration in the blood is 30 mg/100mL. (v) Urea level in the blood is 10 mg/100 mL. |
| A. | (i), (ii) and (iii) |
| B. | (iii), (iv) and (v) |
| C. | (iv) and (v) |
| D. | (i) and (ii) |
| Answer» E. | |
| 1865. |
Systolic pressure of heart is higher than diastolic pressure, because |
| A. | Blood is forcefully pumped into arteries by the heart during systole and not during diastole. |
| B. | Arteries offer resistance to the flowing of blood during systole only. |
| C. | Arteries contract during systole only. |
| D. | Volume of blood in heart is greater during systole than during diastole. |
| Answer» B. Arteries offer resistance to the flowing of blood during systole only. | |
| 1866. |
Which of the following statements about the control of circulation in humans is incorrect? |
| A. | Sympathetic nerve input to skeletal muscle causes the blood vessels in the muscle to dilate. |
| B. | Blood flow can be regulated by autonomic nerve signals emanating from cardiovascular control centres in the medulla of the brain. |
| C. | Carotid artery chemosensors detect low \[{{O}_{2}}\] levels in the blood and promote, increased blood pressure. |
| D. | Hormones such as angiotensin and vasopressin cause venules to constrict. |
| Answer» E. | |
| 1867. |
We feel sleepy just after taking meals because: |
| A. | Blood pressure increases |
| B. | Blood pressure decreases |
| C. | Body weight increases |
| D. | We feel lethargic |
| Answer» C. Body weight increases | |
| 1868. |
Which of the following vein has least amount of urea? |
| A. | Pulmonary vein |
| B. | Hepatic portal vein |
| C. | Hepatic vein |
| D. | Renal vein |
| Answer» E. | |
| 1869. |
In the human heart, blood from the lungs enter the heart through the left atrium, pumps into the left ventricle, out the aorta and through the body, and then returns into the right atrium, pumps into the right ventricle and exits to the lungs. Using the diagram, which set of letters (1, 2, 3, 4, 5) correctly represents the process describe above? |
| A. | 5, 4, 1, 2, 3 |
| B. | 2, 3, 1, 5, 4 |
| C. | 3, 4, 1, 2, 5 |
| D. | 4, 3, 1, 5, 2 |
| Answer» C. 3, 4, 1, 2, 5 | |
| 1870. |
Emphysema damages the tissues of the lungs and slows pulmonary blood flow. This causes blood to back up, stretching and weakening the walls of the heart and blood vessels. Which of the following do you think would be most affected by this backup of blood from the lungs? |
| A. | Aorta |
| B. | Right atrium |
| C. | Left atrium |
| D. | Right ventricle |
| Answer» E. | |
| 1871. |
Which of the following statements (s) is/are incorrect? (i) The AV node and the bundle of His constitute the electrical link between the atria and the ventricles. (ii) The bundle of His is a bundle of electrical nodes which allows the ventricles to contract. (iii) The bundle of His is a group of fibres that carry the electrical impulses through the centre of the heart. (iv) The bundle of His is located in the arterial region. |
| A. | (ii), (iii) and (iv) |
| B. | (i), (iii) and (iv) |
| C. | (i), (ii) and (iv) |
| D. | (i), (ii) and (iii) |
| Answer» E. | |
| 1872. |
A heart attack occurs when: |
| A. | A heart valve malfunctions. |
| B. | A coronary artery is blocked. |
| C. | The heart is weakened by overwork. |
| D. | The aorta is blocked. |
| Answer» C. The heart is weakened by overwork. | |
| 1873. |
Which of the following substances, if introduced into the blood stream, would cause coagulation of blood at the site of its introduction? |
| A. | Prothrombin |
| B. | Fibrinogen |
| C. | Thromboplastin |
| D. | Heparin |
| Answer» D. Heparin | |
| 1874. |
Blood circulation that starts in capillaries and ends in capillaries is called: |
| A. | Portal circulation |
| B. | Hepatic circulation |
| C. | Lymphatic circulation |
| D. | Renal circulation |
| Answer» B. Hepatic circulation | |
| 1875. |
Blood pressure increases and heart rate decreases in response to: |
| A. | Exercise |
| B. | Haemorrage |
| C. | Exposure to high altitude |
| D. | Increased intracranial pressure |
| Answer» E. | |
| 1876. |
A drop of each of the following, is placed separately on four slides. Which of them will not coagulate? |
| A. | Whole blood from pulmonary vein |
| B. | Blood plasma |
| C. | Blood serum |
| D. | Sample from the thoracic duct of lymphatic system. |
| Answer» D. Sample from the thoracic duct of lymphatic system. | |
| 1877. |
You are required to draw blood from a patient and to keep it in a test tube for analysis of blood corpuscles and plasma. You are also provided with the following four types of test tubes. Which of them will you not use for the purpose? |
| A. | Test tube containing calcium bicarbonate |
| B. | Chilled test tube |
| C. | Test tube containing heparin |
| D. | Test tube containing sodium oxalate |
| Answer» B. Chilled test tube | |
| 1878. |
Blood clotting can be prevented by the use of potassium oxalate. It is due to: |
| A. | Checking of conversion of fibrinogen into fibrin. |
| B. | Inactivation of all factors for blood coagulation. |
| C. | Neutralisation of acidic medium. |
| D. | Removal of free \[C{{a}^{2+}}\] ions. |
| Answer» E. | |
| 1879. |
Which of the following best describes an artery? |
| A. | Carries blood away from the heart. |
| B. | Carries oxygenated blood. |
| C. | Contains valves. |
| D. | Has thin walls. |
| Answer» B. Carries oxygenated blood. | |
| 1880. |
Inmammals, veins differs from arteries in having: |
| A. | Thicker walls |
| B. | Deeply present |
| C. | Carry blood away from heart |
| D. | Internal valves |
| Answer» E. | |
| 1881. |
Wall of blood capillary is formed of: |
| A. | Haemocytes |
| B. | Parietal cells |
| C. | Endothelial cells |
| D. | Oxyntic cells |
| Answer» D. Oxyntic cells | |
| 1882. |
Different factors play important roles in coagulation of blood, some of the factors are listed in column-I and their nomenclatures are given in column-II. Find out the accurate matching. Column-I Column-II A. Factor II I. Thromboplastin B. Factor III II. Prothrombin C. Factor VIII III. Hageman factor D. Factor XII IV. Antihaemophilic globulin |
| A. | A-II; B-I; C-IV; D-III |
| B. | A-I; B-II; C-III; D-IV |
| C. | A-III; B-IV; C-II; D-I |
| D. | A-IV; B-III; C-II; D-I |
| Answer» B. A-I; B-II; C-III; D-IV | |
| 1883. |
The accompanying diagram shows three stages in the cardiac cycle. Which of the followiing sequence is correct? |
| A. | 2, 3, 1 |
| B. | 1, 2, 3 |
| C. | 2, 1, 3 |
| D. | 3, 1, 2 |
| Answer» D. 3, 1, 2 | |
| 1884. |
In human, the opening of post caval in the right auricle is guarded by: |
| A. | Bicuspid valve |
| B. | Tricuspid valve |
| C. | Eustachian valve |
| D. | Sino-auricular valve |
| Answer» D. Sino-auricular valve | |
| 1885. |
'P' wave of ECG occurs before the: |
| A. | Onset of ventricular contraction. |
| B. | End of arterial contraction. |
| C. | Beginning of atrial contraction. |
| D. | None of the above. |
| Answer» D. None of the above. | |
| 1886. |
If cardiac supply of vagus nerve is cut then: |
| A. | Rate of heart beat increases. |
| B. | Rate of heart beat decreases. |
| C. | There is no change in heartbeat. |
| D. | Heart stops beating. |
| Answer» B. Rate of heart beat decreases. | |
| 1887. |
Artery differs from vein in having: |
| A. | Narrow wall |
| B. | Thick walls |
| C. | Valves |
| D. | None of the above |
| Answer» C. Valves | |
| 1888. |
Child death may occur in the marriage between: |
| A. | \[R{{h}^{+}}\]man and \[R{{h}^{+}}\] woman. |
| B. | \[R{{h}^{+}}\]man and \[R{{h}^{-}}\] woman. |
| C. | \[R{{h}^{-}}\] man and \[R{{h}^{-}}\] woman. |
| D. | \[R{{h}^{-}}\] man and \[R{{h}^{+}}\] woman. |
| Answer» C. \[R{{h}^{-}}\] man and \[R{{h}^{-}}\] woman. | |
| 1889. |
First heart sound (Lubb) coincides with the ______ wave of ECG: |
| A. | R |
| B. | T |
| C. | P |
| D. | Q |
| Answer» B. T | |
| 1890. |
Which layer of the wall of blood vessels is made up of circular smooth muscles? |
| A. | Outer |
| B. | Middle |
| C. | Inner |
| D. | Both [a] and [b] |
| Answer» C. Inner | |
| 1891. |
Myocardial Infarction is caused by: |
| A. | Hardening of arteries. |
| B. | Lumpy thickness develop in the inner walls of arteries. |
| C. | Clot which may occur in the lumen of a coronary artery. |
| D. | Sudden interruption in blood flow towards a portion of heart. |
| Answer» E. | |
| 1892. |
In arteriosclerosis: |
| A. | Arterial walls become very thin and weak so that the blood oozes out of the walls. |
| B. | Sex linked heredity is involved. |
| C. | Blood coagulates even in the arteries. |
| D. | Arterial walls become inelastic and thickened. |
| Answer» E. | |
| 1893. |
The heart sound 'murmur' is heard during: |
| A. | Closing of bicuspid and tricuspid valves. |
| B. | Closing of semilunar valves. |
| C. | Leaking of blood through valves. |
| D. | All of the above |
| Answer» D. All of the above | |
| 1894. |
Pulmonary aorta in mammalian embryo communicates with carotico-systemic aorta by a thin vessel called ductus arteriosus which latercloses and remains in adult as: |
| A. | Fossa ovalis |
| B. | Ligamentum arteriosus |
| C. | Carotico-pulmonary aperture |
| D. | None of the above |
| Answer» C. Carotico-pulmonary aperture | |
| 1895. |
The normal pH of the arterial blood is: |
| A. | 6.8 |
| B. | 7.8 |
| C. | 7.4 |
| D. | 8.8 |
| Answer» D. 8.8 | |
| 1896. |
The following statement contains some of the events that lead to a 'heart attack'. (i) Blood clot that breaks, loose and passes along blood vessel. (ii) Region of heart muscle suffers a myocardial infarction. (iii) Narrow branch of coronary artery becomes blocked by thrombus. (iv) Thrombus forms on inner surface of coronary artery. The correct sequence of these events is: |
| A. | (i), (iv), (ii), (iii) |
| B. | (i), (iv), (iii), (ii) |
| C. | (iv), (i), (ii), (iii) |
| D. | (iv), (i), (iii), (ii) |
| Answer» E. | |
| 1897. |
Which of the following term is correctly matched with its description? |
| A. | Plasma Straw coloured fluid that consists of suspended blood cells |
| B. | Heart Site where exchange of nutrients and gases occur |
| C. | Capillary A red colour fluid that provides food to the cells |
| D. | Blood Pumping station of the body |
| Answer» B. Heart Site where exchange of nutrients and gases occur | |
| 1898. |
Cardiac output is: |
| A. | The product of heart rate and stroke volume. |
| B. | The product of auricular and ventricular volume. |
| C. | The blood pumped in one minute. |
| D. | Both [a] and [c] |
| Answer» E. | |
| 1899. |
If nerves of heart are cut, then heart will: |
| A. | Beat rhythmically |
| B. | Stop working |
| C. | Beat arhythmically |
| D. | Shrink |
| Answer» B. Stop working | |
| 1900. |
Papillary muscles are associated with: |
| A. | Ventricles |
| B. | Auricles |
| C. | Dorsal aorta |
| D. | Sinus venosus |
| Answer» B. Auricles | |