Multiple choice

If the pacemaker is absent,

  1. only auricles will contract

  2. only ventricles will contract

  3. cardiac muscles will contract in a coordinated manner

  4. cardiac muscles will not contract in a coordinated manner
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

If the pace maker is absent, cardiac muscles will contract in a coordinated manner because pace maker sets the rhythmic contractions.

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