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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The atria receive:
1. | Oxygenated blood | 2. | Deoxygenated blood |
3. | Mixed blood | 4. | Venous blood |
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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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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 normal blood pressure reading in a healthy adult human being would be:
I: | 116/76 mm Hg |
II: | 150/80 mm Hg |
III: | 120/94 mm Hg |
1. | Only I | 2. | Both I and II |
3. | Both I and III | 4. | I, II and III |
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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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