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. |
1. double
2. become four times
3. become eight times
4. remain the same
1. ventricles relax
2. ventricles contract
3. atria relax
4. atria contract
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
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 |
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 |
| 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
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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