Q. No.Origin of heart beat and its conduction is represented by
| 1. | AV bundle → Bundle of His → SA node → Purkinje fibres |
| 2. | SA node→ Purkinje fibres → AV node → Bundle of his |
| 3. | Purkinje fibres → AV node → Bundle of His → SA node |
| 4. | SA node → AV node → Bundle of His → Purkinje fibres |
Subtopic: Human Heart: Cardiac Cycle | Regulation of Cardiac Activity |
91%
Level 1: 80%+
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A patch of nodal tissue responsible for initiating the rhythmic contractile activity of heart is present in:
| 1. | Lower left corner of the left ventricle |
| 2. | Upper right corner of the right atrium |
| 3. | Lower left corner of the right ventricle |
| 4. | Upper left corner of the left atrium |
Subtopic: Regulation of Cardiac Activity |
91%
Level 1: 80%+
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Impulse initiation in the normal human heart occurs at the:
| 1. | Atrioventricular node |
| 2. | Purkinje fibre network |
| 3. | Sinoatrial node |
| 4. | Bundle of His |
Subtopic: Rhythmic Excitation of Human Heart: Part 1 | Rhythmic Excitation of Human Heart: Part 2 | Regulation of Cardiac Activity | Circulatory Pathways |
89%
Level 1: 80%+
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The first heart sound is produced when
| 1. | Semilunar valve shuts |
| 2. | Interventricular pressure decrease |
| 3. | Diastole begins |
| 4. | Bicuspid and tricuspid valves closed quickly |
Subtopic: Regulation of Cardiac Activity |
89%
Level 1: 80%+
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Human heart is :
| 1. | Myogenic |
| 2. | Regulated mostly extrinsically |
| 3. | Neurogenic |
| 4. | Not at all under the controll of autonomic nervous system |
Subtopic: Regulation of Cardiac Activity |
97%
Level 1: 80%+
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During an emergency, sympathetic stimulation to the heart increases cardiac output because it:
| 1. | Decreases heart rate but increases stroke volume |
| 2. | Increases both heart rate and stroke volume by enhancing excitability and contractility |
| 3. | Decreases end-diastolic volume and increases end-systolic volume |
| 4. | Reduces coronary blood flow leading to stronger contraction |
Subtopic: Regulation of Cardiac Activity |
94%
Level 1: 80%+
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The heart rate is slowed by
| 1. | sympathetic nerves |
| 2. | parasympathetic nerves |
| 3. | corpus callosum |
| 4. | both sympathetic and parasympathetic nerves |
Subtopic: Regulation of Cardiac Activity |
87%
Level 1: 80%+
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The neurocenter for the activity of the Heart is located in
| 1. | Pons | 2. | midbrain |
| 3. | medulla oblangata | 4. | cerebrum |
Subtopic: Regulation of Cardiac Activity |
89%
Level 1: 80%+
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Given below are two statements:
| Assertion (A): | Human heart is myogenic in nature. |
| Reason (R): | Normal activities of heart are controlled and regulated by specialized cardiac muscles capable of autoexcitability. |
| 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. |
Subtopic: Regulation of Cardiac Activity |
91%
Level 1: 80%+
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A cardiovascular centre that can moderate the cardiac function through the autonomic neural system is located in the:
| 1. | Pons varoli | 2. | Medulla oblongata |
| 3. | Hypothalamus | 4. | Cerebrum |
Subtopic: Regulation of Cardiac Activity |
89%
Level 1: 80%+
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