Question

57. Upon preventing acetylcholine from diffusing
across a neuromuscular junction, which of the
following will not occur?
Tricky​

Answer 1

Answer:

No action potential will be produced in the affected muscle fiber's plasma membrane'.

Explanation:

The acetylcholine binds to the nicotinic receptors on the post-synaptic membrane. This binding causes the nicotinic receptor channels to open and let sodium ions enter the muscle fibre. If enough of these sodium ions enter the muscle fibre to raise it from its resting potential, they trigger a muscular action potential that spreads throughout the fibre. Therefore, if the release of acetylcholine is prevented the release of sodium ions and hence action potential will not occur in the affected muscle fibre.

So, the correct option is 'No action potential will be produced in the affected muscle fiber's plasma membrane'.