The sino-atrial node (SAN) in the human heart is present in:
1. the right upper corner of the right atrium.
2. the right atrium near the base of inter-atrial septum.
3. the left lower corner of the left atrium.
3. the left atrium near the base of inter-atrial septum.
Subtopic: Â Human Heart: Gross Anatomy |
 96%
From NCERT
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During cardiac cycle:
1. all the four chambers of heart can never be in a relaxed state simultaneously.
2. as the tricuspid valve gets open, blood from the pulmonary artery flows into the right ventricle.
3. all the four chambers of heart can never be in a contracted state simultaneously.
4. as the bicuspid valve gets open, blood from the aorta flows into the left ventricle.
1. all the four chambers of heart can never be in a relaxed state simultaneously.
2. as the tricuspid valve gets open, blood from the pulmonary artery flows into the right ventricle.
3. all the four chambers of heart can never be in a contracted state simultaneously.
4. as the bicuspid valve gets open, blood from the aorta flows into the left ventricle.
Subtopic: Â Human Heart: Cardiac Cycle |
 76%
From NCERT
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The atrial systole increases the flow of blood into the ventricles by about:
1. 10 per cent.
2. 30 per cent.
3. 50 per cent.
4. 70 per cent.
1. 10 per cent.
2. 30 per cent.
3. 50 per cent.
4. 70 per cent.
Subtopic: Â Human Heart: Cardiac Cycle |
 90%
From NCERT
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The action potential is conducted to the ventricular side by:
1. the AVN and AV bundle.
2. the SAN and Internodal pathway.
3. the SAN and AV bundle.
4. the AVN and Internodal pathway.
1. the AVN and AV bundle.
2. the SAN and Internodal pathway.
3. the SAN and AV bundle.
4. the AVN and Internodal pathway.
Subtopic: Â Human Heart: Cardiac Cycle |
 71%
From NCERT
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During ventricular diastole:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | closure of semilunar valves occurs. |
| II: | the tricuspid and bicuspid valves are pushed open. |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Â Human Heart: Cardiac Cycle |
 74%
From NCERT
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If the average duration of cardiac cycle were 0.6 seconds, the number of cardiac cycles per minute will be about:
| 1. | 60 | 2. | 75 |
| 3. | 72 | 4. | 100 |
Subtopic: Â Human Heart: Cardiac Cycle |
 65%
From NCERT
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During each cardiac cycle two prominent sounds are produced which can be easily heard through a stethoscope where:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | The first heart sound (lub) is associated with the opening of the tricuspid and bicuspid valves. |
| II: | The second heart sound (dub) is associated with the opening of the semilunar valves. |
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Â Human Heart: Cardiac Cycle |
 80%
From NCERT
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Consider the two statements:
1. Both Assertion and Reason are true and Reason correctly explains the Assertion.
2. Assertion is true but Reason is false.
3. Both Assertion and Reason are true but Reason does not correctly explain the Assertion.
4. Assertion is false but Reason is true.
| Assertion: | The cardiac output of an athlete will be much higher than that of an ordinary man. |
| Reason: | The body has the ability to alter the stroke volume as well as the heart rate and thereby the cardiac output. |
2. Assertion is true but Reason is false.
3. Both Assertion and Reason are true but Reason does not correctly explain the Assertion.
4. Assertion is false but Reason is true.
Subtopic: Â Human Heart: Cardiac Cycle |
From NCERT
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Consider the two statements:
| Assertion (A): | Any deviation from the normal shape of ECG indicates a possible abnormality or disease. |
| Reason (R): | The ECGs obtained from different individuals have roughly the same shape for a given lead configuration. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | (A) is True but (R) is False. |
| 3. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 4. | (A) is False but (R) is True. |
Subtopic: Â ECG & Coronary Artery Disease |
 68%
From NCERT
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What will be true if we compare the anatomy of a typical artery and a typical vein in human body?
1. The pressure of blood in vein will be higher.
2. The tunica media is comparatively thin in the veins.
3. The colour of the blood will be blue in a vein.
4. The venous RBC will have a lower chloride content.
1. The pressure of blood in vein will be higher.
2. The tunica media is comparatively thin in the veins.
3. The colour of the blood will be blue in a vein.
4. The venous RBC will have a lower chloride content.
Subtopic: Â Human Heart: Double Circulation |
 87%
From NCERT
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