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Q. No.The main advantage of a closed circulatory system, as seen in annelids and chordates, is:
1.
Blood is circulated more quickly, more precisely and at higher pressure to the organs.
2.
Blood directly bathes the tissues, facilitating faster diffusion of gases.
3.
Nutrients and waste are exchanged more efficiently in open spaces.
4.
The heart does not require chambers for efficient circulation.
Subtopic: Circulatory Pathways |
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Consider the given two statements:
Options:
| Statement I: | Fishes possess a two-chambered heart with an atrium and a ventricle, where deoxygenated blood is pumped to the gills for oxygenation. |
| Statement II: | Birds and mammals possess a four-chambered heart, which ensures complete separation of oxygenated and deoxygenated blood. |
| 1. | Both Statement I and Statement II are correct. |
| 2. | Statement I is correct but Statement II is incorrect. |
| 3. | Statement I is incorrect but Statement II is correct. |
| 4. | Both Statement I and Statement II are incorrect. |
Subtopic: Circulatory Pathways |
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Consider the given two statements:
Options:
| Assertion (A): | The sino-atrial node (SAN) is also known as the pacemaker of the heart. |
| Reason (R): | The SAN can generate action potentials at the highest frequency and initiate the heartbeat. |
| 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. |
Subtopic: Human Heart: Gross Anatomy |
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Heart failure is different from cardiac arrest because:
| 1. | Heart failure refers to the heart’s inability to pump sufficient blood, while cardiac arrest is when the heart stops beating entirely. |
| 2. | Heart failure only affects the ventricles, whereas cardiac arrest affects the atria. |
| 3. | Heart failure is reversible, while cardiac arrest is not. |
| 4. | Cardiac arrest is caused by hypertension, while heart failure is caused by valve malfunction. |
Subtopic: DISORDERS OF CIRCULATORY SYSTEM |
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Which of the following rows is correct?
| Oxygenated Blood | Deoxygenated Blood | |||
| 1. | Left atrium | Left ventricle | Right atrium | Right ventricle |
| 2. | Left atrium | Right atrium | Left ventricle | Right ventricle |
| 3. | Left atrium | Right ventricle | Right atrium | Right ventricle |
| 4. | Right atrium | Right ventricle | Left atrium | Left ventricle |
| 5. | Left ventricle | Right atrium | Left atrium | Right ventricle |
Subtopic: Human Heart: Double Circulation |
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Which chambers of the heart pump oxygenated blood?
| 1. | The right and left atria |
| 2. | The right and left ventricles |
| 3. | The right atria and the left ventricle |
| 4. | The left atria and the left ventricle |
Subtopic: Circulatory Pathways |
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What is the function of the coronary arteries?
1. Supply oxygenated blood to the lungs
2. Deliver deoxygenated blood to the liver
3. Transport hormones to the heart
4. Supply oxygenated blood to the heart muscle
1. Supply oxygenated blood to the lungs
2. Deliver deoxygenated blood to the liver
3. Transport hormones to the heart
4. Supply oxygenated blood to the heart muscle
Subtopic: Human Heart: Double Circulation |
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Consider the given two statements:
| Statement I: | Blood in the pulmonary vein is oxygenated. |
| Statement II: | Blood in the pulmonary artery is deoxygenated. |
| 1. | Statement I is correct; Statement II is correct. |
| 2. | Statement I is correct; Statement II is incorrect. |
| 3. | Statement I is incorrect; Statement II is correct. |
| 4. | Statement I is incorrect; Statement II is incorrect. |
Subtopic: Human Heart: Double Circulation |
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Match the components of blood in Column-I with their functions in Column-II:
Options:
1. A-S, B-R, C-P, D-Q
2. A-Q, B-S, C-R, D-P
3. A-R, B-Q, C-S, D-P
4. A-P, B-Q, C-S, D-R
| Column-I (Component) |
Column-II (Function) |
||
| A. | Platelets | P. | Transport oxygen and carbon dioxide |
| B. | White Blood Cells | Q. | Transport nutrients and hormones |
| C. | Red Blood Cells | R. | Defence and immunity |
| D. | Plasma | S. | Blood clotting |
1. A-S, B-R, C-P, D-Q
2. A-Q, B-S, C-R, D-P
3. A-R, B-Q, C-S, D-P
4. A-P, B-Q, C-S, D-R
Subtopic: Blood: General Description & RBC |
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Which of the following explains why veins have valves?
| 1. | To reduce the pressure in venous blood. |
| 2. | To maintain the oxygen concentration in venous blood. |
| 3. | To regulate the blood entering capillaries. |
| 4. | To prevent backflow of blood due to low pressure. |
Subtopic: Human Heart: Cardiac Cycle |
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