Question

When acetylcholine is released into the neuromuscular junction,

a) action potentials are triggered, which lead to activation of the contraction cycle.

b) the muscle membrane depolarizes, creating an end-plate potential (EPP).

c) it binds to receptors that allow Na⁺ and K⁺ ions to cross the sarcolemma.

d) it binds to receptors that allow Na⁺ and K⁺ ions to cross the sarcolemma and the muscle membrane depolarizes, creating an end-plate potential (EPP).

e) it binds to receptors that allow Na⁺ and K⁺ ions to cross the sarcolemma, the muscle membrane depolarizes, creating an end-plate potential (EPP), and action potentials are triggered, which lead to activation of the contraction cycle.