Which events involved in muscle cell contraction are sequenced in the correct order
1)Sodium channels open, allowing sodium to flow in.
2)Impulse reaches axon's synaptic knob.
3)ACh binds to receptors on sarcolemma.
4)Synaptic vesicles fuse with neuron's membrane and release ACh via exocytosis.
5)If enough sodium moves into the muscle cell, an impulse (action potential) develops.

Question

Quizplus · Accepted Answer

The correct sequence of events involved in muscle cell contraction is the impulse reaching the axon's synaptic knob (2), synaptic vesicles fusing with the neuron's membrane and releasing ACh via exocytosis (4), ACh binding to receptors on the sarcolemma (3), sodium channels opening and allowing sodium to flow in (1), and if enough sodium moves into the muscle cell, an impulse (action potential) develops (5). Therefore, option C is the correct sequence of events.

Which Events Involved in Muscle Cell Contraction Are Sequenced in the Correct