Q. No.On a surface ECG, the end of ventricular systole is marked by:
1.
The end of the QRS complex
2.
The beginning of T wave
3.
The end of T wave
4.
The beginning of P wave
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Normal activities of the human heart are regulated:
1. Intrinsically
2. By the autonomic nervous system
3. By the somatic neural system
4. By the adrenal medullary hormones
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A trained athlete can achieve a maximal cardiac output of:
| 1. | 5 – 10 L/min | 2. | 15 – 20 L/min |
| 3. | 25 – 30 L/min | 4. | 55 – 60 L/min |
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All the following statements regarding joint diastole phase of the cardiac cycle are correct except:
| 1. | All chambers are in a relaxed state |
| 2. | The AV valves may remain closed in the initial period |
| 3. | Ventricles get filled in the later part |
| 4. | Semilunar valves remain open |
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Purkinje fibers are:
| 1. | Intrinsic neural fibers in the ventricles |
| 2. | Muscle fibers that interconnect SA node and AV node |
| 3. | Muscle fibers that are distributed in the ventricular musculature |
| 4. | Neural fibers that spread the impulse throughout the ventricular muscle mass |
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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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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
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Certain factors that can initiate coagulation of blood can be released by:
| I: | Platelets in the blood |
| II: | Tissues at the site of injury |
| III: | Liver |
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II and III |
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
| Assertion (A): | The left ventricle pumps the blood with greater force than the right ventricle. |
| Reason (R): | The left ventricle pumps more blood than the right ventricle during each contraction. |
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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