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18/07/2023 7:57 pm
Topic starter
Which of the following is responsible for initiating and maintaining the rhythmic contractile activity of the heart?
(A) S.A. node
(B) A.V. node
(C) A.V. septum
(D) A.V. valve
1 Answer
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18/07/2023 8:01 pm
Correct Option: (A) S.A. node
Explanation:
S.A node generates a maximum of 70-75 action potentials per minute. Since, it is responsible for initiating and maintaining the rhythmic contractile activity of the heart, it is called as pacemaker of the heart.