Question

Which one of the following muscles show/s rhythmic contraction and relaxation throughout life?

• A. Skeletal muscle
• B. Cardiac muscle
• C. Heart muscle
• D. Both (b) and (c)

Answer 1

The correct option is D

Both (b) and (c)

The correct option is D.
Explanation of the correct option:

1. The muscle tissue forming the wall of the heart is called cardiac tissue or heart tissue.
2. Cardiac muscle is composed of numerous elongated, separate cells or fibres which are joined by oblique cross-connection at frequent intervals to form a contractile network of fibres.
3. Cardiac tissues are capable of contracting rhythmically throughout life and are immune to fatigue.

Explanation of the incorrect option:
Option A:

1. Muscular tissue concerned with the movement of the skeleton is known as skeletal muscle.
2. These muscles are also known as striped or striated muscles. It is called striated because it shows cross striations or transverse bands when observed under a light microscope.