Number the following statements in their proper sequence to describe the contraction mechanism in a skeletal muscle cell.     _____   A.  Acetylcholine is released into the neuromuscular junction by the axonal terminal. _____   B.  The action potential, carried deep into the cell, causes the sarcoplasmic reticulum  to release calcium ions. ____   C.  The muscle cell relaxes and lengthens. _____   D.  Acetylcholine diffuses across the neuromuscular junction and binds to receptors  on the sarcolemma. ____   E. The calcium ion concentration at the myofilaments increases; the myofilaments slide past one another, and the cell shortens.

Human Anatomy & Physiology (11th Edition)
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BIO168 Human Anatomy & Physiology I

Practice Worksheet B

Sequence of muscle contraction

 

Number the following statements in their proper sequence to describe the contraction mechanism in a skeletal muscle cell.

 

 

_____   A.  Acetylcholine is released into the neuromuscular junction by the axonal terminal.

_____   B.  The action potential, carried deep into the cell, causes the sarcoplasmic reticulum  to release calcium ions.

____   C.  The muscle cell relaxes and lengthens.

_____   D.  Acetylcholine diffuses across the neuromuscular junction and binds to receptors  on the sarcolemma.

____   E. The calcium ion concentration at the myofilaments increases; the myofilaments slide past one another, and the cell shortens.

_____  F.  Depolarization occurs, and the action potential is generated.

_____   G.  As calcium is actively reabsorbed into the sarcoplasmic reticulum, its concentration  at the myofilaments decreases.

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