Question

When a neural signal reaching the neuromuscular junction releases acetylcholine, an action potential is generated first in
(A) Sarcolemma
(B) Sarcoplasmic reticulum
(C) Sarcosomes
(D) Sarcomeres



——answer asap——-

Answer 1

Answer:

( A) sarcolemma

Explanation:

If enough of these sodium ions enter the muscle fibre to raise it from its resting potential of -95 mV to about -50 mV, they trigger a muscular action potential that spreads throughout the fibre. This potential travels first along the surface of the sarcolemma, the excitable membrane surrounding the various contractile cylindrical structures known as myofibrils. To reach the myofibrils, some of which are located deep in the muscle fibre, the muscular action potential travels through the T-tubule system (the "T" stands for "transverse"), which starts in the sarcolemma and penetrates into the heart of the fibre.

Answer 2

Answer:

(A) Sarcolemma......