Question

Which of the following is NOT true about muscle cells?
a. The sarcoplasmic reticulum and the t-tubules are physically fused together
b. It is multinuclear
c. The plasma membrane is called a sarcolemma
d. An AP arriving at the neuromuscular junction triggers the release of Calcium into the cytoplasm

Answer 1

Answer:

The correct answer will be option B.

Explanation:

The muscle cells are the long, cylindrical, tubular structure which is made up of the myofilaments- actin and myosin.  

The plasma membrane of a muscle cell is known as sarcolemma and the cytoplasm of the cell is known as sarcoplasm. Each muscle cell has the small holes present on its sarcolemma through which the nerve impulse are transmitted from the sarcolemma to sarcoplasmic reticulum where calcium ions are released into the sarcoplasm.

In the given question the, the muscle cell is multi-nucleated which is the case of skeletal muscles only. The muscle cells have a single nucleus in smooth and cardiac muscles.

Thus, option B is the correct answer.