Q. No.Which among the following is correct during each cardiac cycle?
1. The volume of blood pumped by right and left ventricles is same
2. The volume of blood pumped by right and left ventricles is different
3. The volume of blood received by right and left atria is different
4. The volume of blood received by pulmonary arteries and aorta is different
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Both heart rate and stroke volume in a human get doubled during exercise. His cardiac output will:
| 1. | double | 2. | become four times |
| 3. | become eight times | 4. | remain the same |
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Blood enters the heart because muscles of the:
| 1. | ventricles relax | 2. | ventricles contract |
| 3. | atria relax | 4. | atria contract |
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Identify the incorrectly matched pair:
1. Average duration of a cardiac cycle: 0.8 sec
2. Stroke volume of each ventricle: 120 ml
3. Highest normal systolic blood pressure: 140 mm Hg
4. Highest normal diastolic blood pressure: 90 mm Hg
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During ventricular contraction in a cardiac cycle:
1. the AV valves close earlier than the opening of semi lunar vales
2. the AV valves close earlier than the closure of semi lunar vales
3. the AV valves close later than the opening of semi lunar vales
4. the closure of AV valves and opening of semi lunar valves occur simultaneously
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The sinoatrial node is the normal pacemaker of the human heart because it:
1. can form action potentials that can spread throughout the rest of the heart
2. depolarizes to its threshold potential before other pacemakers in the heart
3. is located in the top of right atrial wall
4. is most likely to form an ectopic focus
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| Assertion (A): | The increased efficiency of the double circulatory system in mammals and birds is thought to have been important in the evolution of endothermy. |
| Reason (R): | Crocodile, a reptile, is not an endotherm in spite of having a four chambered heart. |
In the light of the above statements choose the correct answer from the options given below:
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
All terrestrial vertebrates possess:
1. A muscle or elastic membrane to increase thoracic volume
2. A renal portal system
3. A skin that does allow diffusion of gases
4. At least a three chambered heart
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Consider the diagram of the human heart with various parts labeled as numbers. All statements given will be correct except:
1. Simultaneous closure of 3 and 6 produces first heart sound
2. Simultaneous closure of 2 and 8 produces second heart sound
3. 5 pumps more blood than 4 as it has thicker musculature
4. Both 1 and 7 receive venous blood
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