First slide

Muscle

Question

Muscle contraction is stimulated by the release of acetylcholine at the

Easy

A

sarcoplasmic reticulum
B

neuromuscular junction
C

transverse tubules
D

myofibrils

Solution

A neural signal reaching the neuromuscular junction releases acetylcholine which generates an action potential in the sarcolemma. This spreads through the muscle fibre and causes the release of calcium ions from sarcoplasmic reticulum into the sarcoplasm, which leads to muscle contraction.

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