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Muscle Contraction Process

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Questions and Answers

What triggers the release of acetylcholine into the synaptic cleft at the neuromuscular junction?

Propagation of action potential along the sarcolemma

Generation of action potential in the muscle fiber

Arrival of an action potential in the motor neuron (correct)

Binding of acetylcholine to receptors on the motor end plate

What does acetylcholine bind to on the muscle fiber?

Sarcoplasmic reticulum (SR) membrane

Troponin on actin filaments

Receptors on the motor end plate (correct)

T-tubules on the sarcolemma

What triggers an action potential along the sarcolemma of a muscle cell?

Binding of calcium ions to troponin

End-plate potential (EPP) reaching the threshold (correct)

Propagation of action potential in the motor neuron

Release of acetylcholine into the synaptic cleft

Where does the action potential travel along before penetrating into the muscle fiber?

Sarcolemma and T-tubules Signup and view all the answers

What signals the release of calcium ions from the sarcoplasmic reticulum (SR) in a muscle cell?

Action potential in T-tubules Signup and view all the answers

What do calcium ions bind to in a muscle cell?

Troponin, a regulatory protein associated with actin filaments Signup and view all the answers

What causes the exposure of myosin-binding sites on actin filaments?

Binding of calcium to troponin Signup and view all the answers

What provides energy for the myosin heads to pull the actin filaments?

ATP hydrolysis Signup and view all the answers

What leads to the relaxation of the muscle fiber?

Pumping of calcium ions back into the sarcoplasmic reticulum Signup and view all the answers

What binds to the exposed sites on actin, forming cross-bridges?

Myosin heads from the thick filaments Signup and view all the answers

What causes the sarcomere to shorten and the muscle to contract?

Sliding of actin over myosin filaments Signup and view all the answers