Multiple choice

The heart contains many groups of nodal fibres and nerves. Initiation of the heartbeat occurs in which part of the following?

  1. SA node

  2. AV node

  3. Vagus nerve

  4. Cardiac nerves

  5. -

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A Correct answer
Explanation

The SA node is also known as the sinu-atrial node and is the natural pacemaker of the heart. Initiation of the heartbeat occurs in the SA node.