Q. No.The second heart sound [dub] is associated with simultaneous closure of:
| 1. | Right AV and pulmonary semilunar valve |
| 2. | Left AV and aortic semilunar valve |
| 3. | Right and left AV valves |
| 4. | Right and left semilunar valves |
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The first heart sound is heard during:
| 1. | beginning of ventricular systole |
| 2. | end of ventricular systole |
| 3. | atrial systole |
| 4. | ventricular ejection |
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The aortic semilunar valve prevents blood from returning to the _____.
| 1. | left ventricle | 2. | aorta |
| 3. | right ventricle | 4. | left atrium |
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Statement I: A carries oxygenated blood and B carries deoxygenated blood.
Statement II: D and C close simultaneously during the beginning of ventricular diastole.
Statement III: E and F close simultaneously during the beginning of ventricular systole.
1. Only Statement I
2. Only Statement II and Statement III
3. None of the three statements is true
4. Statement I, Statement II and Statement III
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Identify the state in which the atria and the ventricles are when most of the ventricular filling occurs:
1. Both the atria and ventricles are in systole
2. The atria are in diastole and the ventricles are in systole
3. Both the atria and ventricles are in diastole
4. The atria are in systole and the ventricles are in diastole
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Cardiac output is defined as
1. blood pressure X stroke volume.
2. peripheral resistance X heart rate.
3. heart rate X stroke volume.
4. Systolic pressure – diastolic pressure.
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If the atrioventricular node is damaged:
1. SA node would not develop action potential
2. atria will fail to contract
3. the impulse will not reach AV node
4. the impulse will not reach ventricles
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What is the percentage of atrial blood that flows into the ventricles without atrial systole?
| 1. | 90 | 2. | 70 |
| 3. | 50 | 4. | 30 |
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A tricuspid valve will prevent flow of blood from:
1 Right atrium to right ventricle
2. Right ventricle to right atrium
3. Left atrium to left ventricle
4. Left ventricle to left atrium
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| Assertion (A): | If the SA node does not function, or the impulse generated in the SA node is blocked before it travels down the electrical conduction system, the heart would stop. |
| Reason (R): | No other part of the nodal tissue of the heart is capable of generating the impulse. |
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. |
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