Question

Assertion : Intercalated discs are important regions of cardiac muscle cells.
Reason : Intercalated discs function as boosters for muscle contraction waves.

• A. If Assertion is true but Reason is false.
• B. If both Assertion and Reason are false.
• C. If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
• D. If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

Answer 1

The correct option is C If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

Cardiac muscle cells are short cylindrical cells joined end to end and by side branching to form a network. Intercalated discs are specialised regions where the dense gap junctions are formed in between the cardiac muscle cells. As cardiac muscle possesses considerable rhythmicity and generates its own wave of excitation, these discs function as boosters for muscle contraction waves.