Q. No.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
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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What separates the right and the left atria in the human heart?
| 1. | A thin muscular wall | 2. | A thick muscular wall |
| 3. | A thin fibrous membrane | 4. | A thick fibrous membrane |
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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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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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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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The first heart sound is heard during the:
1. Beginning of ventricular systole
2. End of ventricular systole
3. Beginning of atrial systole
4. End of ventricular diastole
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When the stroke volume of the ventricles is much less than the expected values, the heart is said to be:
1. Fibrillating
2. Blocked
3. Arrested
4. Failing
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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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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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