SSC GD 2026 PYQ — Question 33

Correct Answer:

Involuntary muscles

Explanation:

Cardiac muscles are specialized muscle tissues found exclusively in the walls of the heart. They are classified as involuntary muscles because their rhythmic contraction and relaxation are not under conscious control; instead, they function automatically, regulated by the autonomic nervous system. Structurally, they appear striated (striped) similar to skeletal muscles, but their action is involuntary like smooth muscles, allowing the heart to pump blood continuously without fatiguing over a lifetime.

Additional Points:

Cardiac muscle cells are interconnected by specialized junction regions known as intercalated discs, which allow electrical impulses to travel rapidly from cell to cell, enabling synchronized contraction of the heart chambers.

Important Questions and Answers:

Question: What type of muscle tissue primarily forms the thick middle layer of the heart (myocardium)?

Answer: Cardiac muscle tissue.

Question: What are the specialized junctions that connect adjacent cardiac muscle cells called?

Answer: Intercalated discs.