Multiple choice

What is the function of SA node?

  1. It is the site from where impulses for contraction originate.

  2. It prevents the valves from being pushed into the auricles at the time of ventricular contraction.

  3. It separates the two ventricles.

  4. It protects the heart against injury and friction.
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A Correct answer
Explanation

Mammalian heart is myogenic heart, i.e heartbeat originates from muscle. The specialised area where impulses for contraction originate is called SA node.

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