How many of the given statements are correct:
I:
Fishes have a 2-chambered heart with an atrium and a ventricle.
II:
Amphibians and the reptiles (except crocodiles) have a 3-chambered heart with two atria and a single ventricle.
III:
Crocodiles, birds and mammals possess a 4-chambered heart with two atria and two ventricles.
IV:
The only vertebrates where the heart pumps out deoxygenated blood are fishes.
1.
1
2.
2
3.
3
4.
4
Subtopic: Â Circulatory Pathways |
From NCERT
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The human heart:
1. is derived from embryonic endoderm.
2. is situated in the thoracic cavity, in between the two lungs.
3. has the size and shape of a baseball.
4. is protected by a single walled membranous bag, pericardium.
1. is derived from embryonic endoderm.
2. is situated in the thoracic cavity, in between the two lungs.
3. has the size and shape of a baseball.
4. is protected by a single walled membranous bag, pericardium.
Subtopic: Â Human Heart: Gross Anatomy |Â Human Heart: Double Circulation |
 93%
From NCERT
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Consider the given statements:
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
| I: | The opening between the right atrium and the right ventricle is guarded by the tricuspid valve. |
| II: | A bicuspid or mitral valve guards the opening between the left atrium and the left ventricle. |
| III: | The openings of the right and the left ventricles into the pulmonary artery and the aorta respectively are provided with the semilunar valves. |
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
Subtopic: Â Human Heart: Cardiac Cycle |
 93%
From NCERT
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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.
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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