Which of the following is the correct sequence of events for muscle contractions?
A) muscle cell action potential, neurotransmitter release, ATP-driven power stroke, calcium ion release from SR, sliding of myofilaments
B) motor neuron action potential, neurotransmitter release, muscle cell action potential, release of calcium ions from SR, ATP-driven power stroke, sliding of myofilaments
C) neurotransmitter release, motor neuron action potential, muscle cell action potential, release of calcium ions from SR, ATP-driven power stroke
D) neurotransmitter release, muscle cell action potential, motor neuron action potential, release of calcium ions from SR, sliding of myofilaments, ATP-driven power stroke

Question

Quizplus · Accepted Answer

The correct sequence of events for muscle contractions is: motor neuron action potential, neurotransmitter release, muscle cell action potential, release of calcium ions from the sarcoplasmic reticulum (SR), sliding of myofilaments, and ATP-driven power stroke. Choice B is the only option that lists these events in the correct order. Choice A is incorrect because it lists the release of calcium ions from the SR after the power stroke, which is incorrect. Choice C is incorrect because it lists the motor neuron action potential after the neurotransmitter release, which is incorrect. Choice D is incorrect because it lists the muscle cell action potential before the neurotransmitter release, which is also incorrect.

Which of the Following Is the Correct Sequence of Events