2014 AIPMT Locomotion and MovementMuscle contraction Easy Question 2 of 2 in Muscle contraction

Stimulation of a muscle fiber by a motor neuron occurs at:

A the neuromuscular junction
B the transverse tubules
C the myofibril
D the sarcoplasmic reticulum

The answer is A.

Solution

A motor neuron meets the sarcolemma of a muscle fibre at the neuromuscular junction (motor end plate), where acetylcholine is released and generates an action potential.

Concept Neuromuscular junction

Muscle contraction in past papers

2 questions from this chapter have appeared across 2 exam years.