Question

A muscle fiber possesses striations and intercalated discs. This muscle fiber is

• A. Smooth muscle fiber.
• B. Cardiac muscle fiber.
• C. Skeletal muscle fiber.
• D. Non‐striated muscle fiber.

Answer 1

Answer: (B)

Cardiac muscle (heart muscle) is a type of involuntary striated muscle found in the walls of the heart, specifically the myocardium. Cardiac muscle is one of three major types of muscle, the others being skeletal and smooth muscle. Cardiac muscle exhibits cross striations formed by alternating segments of thick and thin protein filaments. Intercalated discs are complex adhering structures present in cardiac muscles and intercalated discs are an identifying feature of cardiac muscle. (Note: Recollect the observations made during Biology Practicals).