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

The correct answer is:

•motor neuron action potential,

The contraction of a muscle cell begins with the nerve impulse arriving at the neuromuscular junction (motor neuron muscle cell junction)

•  neurotransmitter release,  

When action potential gets to the end of motor neuron it triggers it to release neurotransmitters which will bind to its receptor on the muscle cell

•muscle cell action potential,

Binding of the neurotransmitter to its receptor on the muscle cell will fire its own action potential.

•  release of calcium ions from SR,  

The nerve impulse is carried to the sarcoplasmic reticulum (SR) and consequently Ca2+ channels open , Ca2+ leave the sarcoplasmic reticulum and attach to troponin – the protein molecules that are situated on actin filaments.

•ATP-driven power stroke,

Active sites of actin are open thanks to Ca2+ and myosin heads can bind to them, using the ATP energy

•  sliding of myofilaments

Contraction occurs.

sadness is not good

explanation: