Which muscles act involuntarily?
  1. Striated muscles
  2. Smooth muscles
  3. Cardiac muscles
  4. Skeletal muscles
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (i) and (iv)

AcademicBiologyNCERTClass 9

Correct Answer: (b) (ii) and (iii)

Explanation:

Smooth and cardiac muscles act involuntarily.

Cardiac muscles are involuntary that keep the heart pumping. Cardiac muscles have specialized cells known as pacemaker cells that control the contractions of the heart.

raja
Updated on 10-Oct-2022 13:30:51

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