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Thin contractile protein involved in cross-bridge formation, comes in filamentous or globular forms.

actin

Store neurotransmitters, and following a Ca2+ driven signal, dump neurotransmitters into the synapse.

Synaptic vesicles

The structure at the end of the axon that contains neurotransmitters and vesicles.

Symnatic terminal

The functional unit of the muscle fiber that includes the A-band, I-band, H-zone and the M-line.

sacremere

he ion responsible for depolarizing the muscle membrane by traveling through the nACh receptor,

downits electrochemical gradient.

Sodium

hick filamentous contractile protein involved in cross-bridge formation, has a club-like appearance

witha “head.”

Myosin

A neurotransmitter derived from choline; responsible for sending the excitatory signal in the

neuromuscular junction.

Acetylcholine

These invaginations allow depolarization of the muscle membrane to quickly penetrate from

thesarcolemma to the myofibril.

T tibule

Large and complex terminal formation by which an axon of a motor neuron establishes synaptic contact

with a skeletal muscle fiber, transmitting neural impulses to a muscle.

Motor end plate

the plasma membrane of a musle’ fibers

sacrol;ema

The enzyme responsible for stopping the ACh signal. Functions by metabolizing ACh into choline,

whichis recycled, and acetate.

Acetylcholinesterase

Responsible for opening a ligand-gated Na+/K+ channel in the muscle membrane when the proper ligand

binds to it.

Nicotenic acetylcholine receptor

An electrical change which brings the relative charge of the inside of the cell more positive; necessary for

transmission of electrical impulses within a cell, or from one cell to another.

Depololarization

Modified endoplasmic reticulum, stores and releases calcium

Sacrplasmic reticulum