Multiple choice

Which of the following does not characterise skeletal muscle contractions in humans?

  1. The alpha motor neuron generates action potential.

  2. The neurotransmitter noradrenaline diffuses across the synapse and binds to nicotinic acetylcholine receptors on the myocyte.

  3. The end-plate potential spreads evenly across the myocyte's sarcolemma.

  4. The T-tubule system accomodates voltage-dependent calcium plexus.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This statement is incorrect. The neurotransmitter acetylcholine diffuses across the synapse and binds to nicotinic acetylcholine receptors on the myocyte, opening them. An influx of Na+ and an efflux of K+ results, depolarising the cell and generating an end-plate potential.

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