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Question
The frequency of heart beat in our body is maintained by :
The frequency of heart beat in our body is maintained by :
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Solution
The correct option is D SA Node
- Sino atrial node (SA node) is the pacemaker of the heart. It is a microscopic area of specialized cardiac muscle located in the upper wall of the right atrium near the entry of the vena cava.
- Fibres of the SA node are self excitatory, contracting rhythmically at around 70 times per minute. The contractions are transmitted to the other parts of the heart which results in the formation of the heartbeat.
- Following each contraction, the impulse spreads throughout the atrial muscle and into fibres connecting the SA node with the atrioventricular node.
- The SA node is supplied by fibres of the autonomic nervous system. The impulses arriving at the node accelerate or decrease the heart rate.
Thus, the correct answer is option B.
- Sino atrial node (SA node) is the pacemaker of the heart. It is a microscopic area of specialized cardiac muscle located in the upper wall of the right atrium near the entry of the vena cava.
- Fibres of the SA node are self excitatory, contracting rhythmically at around 70 times per minute. The contractions are transmitted to the other parts of the heart which results in the formation of the heartbeat.
- Following each contraction, the impulse spreads throughout the atrial muscle and into fibres connecting the SA node with the atrioventricular node.
- The SA node is supplied by fibres of the autonomic nervous system. The impulses arriving at the node accelerate or decrease the heart rate.
Thus, the correct answer is option B.
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