Mastering A&P Muscles (9a)

In the figure, which structure corresponds to a single skeletal muscle cell?

In a neuromuscular junction, synaptic vesicles in the motor neuron contain which neurotransmitters?

When an action potential arrives at the axon terminal of a motor neuron, which ion channels open?

What means of membrane transport is used to release the neurotransmitter into the synaptic cleft?

The binding of the neurotransmitter to receptors on the motor end plate causes which of the following to occur?

How is acetylcholine removed from the synaptic cleft?

The action potential on the muscle cell leads to contraction due to the release of calcium ions. Where are calcium ions stored in the muscle cell?

Which of the following is true concerning the anatomy of a skeletal muscle fiber?

The calcium that initiates skeletal muscle contraction is released from what structure(s)?

Which of the following is composed of myosin?

In muscle fibers, which regulatory protein blocks the attachment of myosin heads to actin?

What event most directly triggers the release of calcium from the terminal cisternae

How do calcium ions initiate contraction in skeletal muscle fibers?

Which of the following best describes the events of "excitation" in "excitation-contraction coupling"?

Which of the following best describes the events of "contraction" in "excitation-contraction coupling"?

What causes the release of calcium from the terminal cisternae of the sarcoplasmic reticulum within a muscle cell?

The binding of calcium to which molecule cause the myosin binding sites to be exposed?

A myosin head binds to which molecule to form a cross bridge?

What causes the myosin head to disconnect from actin?

What causes the power stroke?

The major role of the sarcoplasmic reticulum is to regulate ________.

What event directly triggers the release of neurotransmitter shown in A?

Which statement accurately describes the event indicated by B?

Which protein is indicated by E?

The protein actin is indicated by which letter?

The molecular interaction described as a "cross bridge" involves the binding of which two of the letters below?

What is the role of tropomyosin in skeletal muscles?