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IB Biology HL 3.3.4 Neuromuscular Junction Question Bank

Practise IB Biology HL 3.3.4 by explaining how a motor end-plate action potential triggers neurotransmitter release and calcium mobilisation for contraction.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Explain neurotransmitter release at the motor end plate after an action potential arrives.
  • Link neuromuscular signalling to calcium release from the sarcoplasmic reticulum.

B3.3.4 (HL)—Motor units question 1

[Maximum number: 1]

What happens when an action potential reaches motor end plates?

A

Calcium ions are absorbed by the muscle fibres.

B

The sarcomeres relax.

C

Neurotransmitter is released.

D

Action potential is passed to the neuron.

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