Which of the following does not propagate (move) an action potential (i.e. which is not depolarized)?

An unknown drug (Agent X) appears to block depolarization of the membrane.  How might this drug work?

During absolute refractory period, it is ____________________________ to have another action potential. 

Schwann cells wrap nerves in the ________ forming the myelin sheath.  This allows nerves to use saltatory conduction, where ion channels open at the ___________.

When acetylcholine binds to a receptor, it makes ___________move into the muscle during skeletal muscle contraction.

TRUE or FALSE: When muscles contract, the A band shortens.

The epimysium is deep to the endomysium.

The area of the sarcomere where there are only actin filaments is the:

When a nerve impulse reaches a muscle cell, the muscle cell contracts.  If a second nerve impulse reaches a muscle cell before the cell relaxes this will lead to a stronger muscle cell contraction.  This process is called:

Adductors move a body part toward the midline.