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 myofilamentsneurotransmitter 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 myofilamentsneurotransmitter 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

Question

lyndsayfaulkner1108 lyndsayfaulkner1108

06-03-2019
Biology

contestada

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 myofilamentsneurotransmitter 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 myofilamentsneurotransmitter 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

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BioWizard BioWizard · Answer 1 · 2019-03-11T17:48:56+01:00

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.