Place the following events of excitation in the correct order.
1)ion channels on the sarcolemma open and sodium ions enter the muscle fiber
2)the entry of sodium ions into the muscle fiber depolarizes the sarcolemma locally
3)acetylcholine is released from vesicles in the motor neuron into the synaptic cleft
4)an action potential arrives at the axon terminal of a motor neuron
5)acetylcholine binds to ligand-gated sodium ion channels in the motor end plate

Question

Place the following events of excitation in the correct order. 
1)ion channels on the sarcolemma open and sodium ions enter the muscle fiber
2)the entry of sodium ions into the muscle fiber depolarizes the sarcolemma locally
3)acetylcholine is released from vesicles in the motor neuron into the synaptic cleft
4)an action potential arrives at the axon terminal of a motor neuron
5)acetylcholine binds to ligand-gated sodium ion channels in the motor end plate

Quizplus · Accepted Answer

The correct sequence of events for excitation in a muscle fiber is: 
1) An action potential arrives at the axon terminal of a motor neuron 
2) Acetylcholine is released from vesicles in the motor neuron into the synaptic cleft 
3) Acetylcholine binds to ligand-gated sodium ion channels in the motor end plate 
4) Ion channels on the sarcolemma open and sodium ions enter the muscle fiber 
5) The entry of sodium ions into the muscle fiber depolarizes the sarcolemma locally. Thus, the correct order of events is 4, 3, 5, 1, 2 which matches with option B.

Place the Following Events of Excitation in the Correct Order