Question

Contraction and the relaxation of the heart is controlled by the _____

• A. Cardiac muscle
• B. Smooth muscle
• C. Striated muscle
• D. None of these

Answer 1

The correct option is A Cardiac muscle

Cardiac muscle is one of three types of vertebrate muscles, with the other two being skeletal and smooth muscles. It is an involuntary, striated muscle that constitutes the main tissue of the wall of the heart. The primary function of cardiac muscle is to contract and relax.

So, the correct option is 'Cardiac muscles'.