Question

Conducts a muscle impulse deep into a sarcoplasm to the cisternae?

A) T-tubules
B) Sarcomere
C) Myosin
D) Troponin

Answer 1

The correct answer is A) T-tubules. T-tubules carry the action potential deep into the sarcoplasm to the cisternae of the sarcoplasmic reticulum.

Step-by-step explanation:

The correct answer is A) T-tubules. T-tubules, also known as transverse tubules, are invaginations of the sarcolemma (cell membrane) in muscle cells. They carry the action potential deep into the sarcoplasm (cytoplasm of muscle cell) to the cisternae of the sarcoplasmic reticulum (SR). This triggers the release of calcium (Ca++) from the SR, which is necessary for muscle contraction.