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MMLU-Pro / 6009 / An action potential arriving at the motor endplate causes release of:

Problem

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question

An action potential arriving at the motor endplate causes release of:

category

health

options

  1. adrenaline which speeds up muscle metabolism.
  2. noradrenaline which increases muscle metabolic activity.
  3. sodium ions which binds to sodium receptors on the muscle membrane.
  4. acetylcholine which traverses the neuromuscular junction.
  5. acetylcholine which is broken down by acetylcholinesterase in the synaptic cleft.
  6. calcium ions which initiate an action potential along the muscle fibre.
  7. dopamine which initiates muscle contraction.
  8. serotonin which reduces muscle excitability.
  9. potassium ions which hyperpolarize the muscle membrane.
  10. glutamate which acts as a neurotransmitter at the neuromuscular junction.

src

ori_mmlu-college_medicine

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Source and history

Official source

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