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Muscle fiber

A skeletal muscle cell.


Small bundle of muscle fibers.


Fibrous connective tissue that connects muscles to bones.


Layer of connective tissue that closely surrounds a skeletal muscle.


extends inward from the epimysium and separates muscle tissue into fascicles.


Layer of connective tissue with in a fascicle that surrounds muscle fibers.


Membrane of a muscle cell.


Cytoplasm of a muscle cell that contains many oval nuclei and mitochondria.

Sarcoplasmic Reticulum

Stores and pumps calcium during muscle stimulation.


Basic unit of a muscle cell. From Z-line to Z-line.

Neuromuscular junction

area where a nerve cell stimulates a muscle cell

Motor Neuron

Neurons that stimulate structures in our body.

Motor Unit

One set of muscle cells stimulated by a single neuron.


Space between synaptic bulb and muscle.


Chemical messengers released from neurons.

motor end-plate

area of a muscle cell where receptors are found.

Prime mover

Muscle that provide a particular body movement.


Muscle that provides opposite movement of a prime mover


Muscle that assists a prime mover.


End of a muscle that attaches to a relatively immovable part.


End of a muscle that attaches to a movable part. Always moves toward the origin.

Fast twitch fibers

Burn ATP faster to provide fast movements. They use less oxygen and are pale in color.

Slow twitch fibers

Burn ATP slower and allow posture muscles to have stamina. They are red in color because they use more oxygen.


Protein in muscles that give them their red color. They allow muscles to store oxygen.


Minimum amount of neurotransmitter needed to cause a muscle contraction.

all or none principle

Cells either contract or they don't because a cell cant partially contract.


long sustained contraction.


short contraction

isometric muscle contraction

muscle contraction where the length of the muscle remains the same. ( never produces movement)

isotonic muscle contraction

muscle contraction where the muscle tone doesn't change. (always produces movement)

Muscle fatigue

Muscles produce less force when continuously used.

Muscle soreness

indicates damage or potential for damage.


Proteins are broken down when muscles aren't used, muscle gets smaller


Proteins are made when muscles are used, muscle gets bigger.

Rigor mortis

Contraction of Skeletal muscle cells after death.

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