Question

Select the correct statement.

• A. Striated muscles fibres are spindle shaped and show cross striations.
• B. Cardiac muscles show presence of intercalated disc.
• C. Smooth muscles show presence of large number of peripheral nuclei.
• D. Pace maker consists of nerve fibres in human beings.

Hint:

Cardiac muscles are unique due to the presence of intercalated discs, which help synchronize heart contractions.

Answer 1

The Correct Option is B

Step 1: Understanding the types of muscles.
There are three types of muscles in the human body: striated (skeletal), cardiac, and smooth muscles. Each type has distinct characteristics.
Step 2: Analyzing the options.
(A) Striated muscles fibres are spindle shaped and show cross striations: Incorrect, striated muscles are not spindle-shaped; they have long, cylindrical fibers and show cross striations.
(B) Cardiac muscles show presence of intercalated disc: Correct, cardiac muscles are characterized by intercalated discs which help in transmitting signals for synchronized contraction.
(C) Smooth muscles show presence of large number of peripheral nuclei: Incorrect, smooth muscles have a single nucleus centrally located, not many peripheral nuclei.
(D) Pace maker consists of nerve fibres in human beings: Incorrect, the pacemaker consists of specialized muscle fibers, not nerve fibers.
Step 3: Conclusion.
The correct answer is (B) Cardiac muscles show presence of intercalated disc, as this is a defining characteristic of cardiac muscle tissue.