The strength of ventricular contraction increases when SAN is stimulated by
(1) Vagus nerve
(2) Parasympathetic nerve
(3) Sympathetic nerve
(4) All of these
Answers
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Answer:
1
Explanation:
vagus nerve stimulation increases right ventricular contraction
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Answer: The correct answer is (3) Sympathetic nerve.
Explanation:
The vagus nerve is stimulated, the body's blood vessels dilate, especially those in the lower extremities, and the heart temporarily slows down. So, decreases the strength of ventricular contraction.
The neural signals sent by the sympathetic nerves can increases the strength of ventricular contraction.
Parasympathetic neural signals act antagonistically act to the sympathetic neural signal and decreases the strength of ventricular contraction.
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