Question

which of the following is the correct sequence of events for muscle contractions?
generation of a motor neuron action potential, neurotransmitter release, generation of a muscle cell action potential, release of calcium ions from sr, atp - driven power stroke, sliding of myofilaments
generation of a muscle cell action potential, neurotransmitter release, atp - driven power stroke, calcium ion release from sr, sliding of myofilaments
neurotransmitter release, generation of a motor neuron action potential, generation of a muscle cell action potential, release of calcium ions from sr, atp - driven power stroke
neurotransmitter release, generation of a muscle cell action potential, generation of a motor neuron action potential, release of calcium ions from sr, sliding of myofilaments, atp - driven power stroke

Explanation:

Muscle contraction starts with a motor neuron action potential. This leads to neurotransmitter release. The neurotransmitter causes a muscle cell action potential. Then calcium ions are released from the sarcoplasmic reticulum (SR). ATP - driven power stroke occurs which causes the sliding of myofilaments.

Answer:

generation of a motor neuron action potential, neurotransmitter release, generation of a muscle cell action potential, release of calcium ions from SR, ATP - driven power stroke, sliding of myofilaments