Moderate
A Rhythmic Beating of Cardiac muscle in a Mammalian heart is initiated by the_________?
Correct answer: C. Sinoatrial node
- A. Article
- B. Ventricle
- C. Sinoatrial node
- D. Atrioventricular node
Explanation
The sinoatrial node acts as the heart’s natural pacemaker and normally initiates each cardiac cycle. The atrioventricular node conducts the impulse onward after the atria have been activated.
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