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The kind of energy that muscles use to contract.


An individual skeletal muscle is separated from adjacent muscles.


Layers of connective tissue extending into the muscle to form partitions between muscle bundles are continuous with attachments of muscle to periosteum.

Actin / Myosin

The char. striated appearance of skeletal muscle is due to the arrangement of alternating protein filiments.


Functional units of muscle contraction.

Active filaments

What I bands are composed of.

Neuromuscular junction

The union between a nerve fiber and a muscle fiber.

Motor unit

A motor neuron and the muscle fibers it controls.

Shortening of muscle fiber

The result of the cross-bridge of the myosin molecule forming a linkage with the actin filaments.


The neurotransmitter that is necessary for the transmission of an impulse from a nerve to a skeletal muscle fiber.


The energy used in muscle contraction is supplied by the decomposition of. . .

Creatine phosphate

A substance that stores of the substance in #12 are in low supply.


The ion necessary to link myosine and actin.

Lactic acid

Prolonged muscle use, muscle fatigue.

Muscle tissue

The tissue that produces a major source of heat.

Threshold stimulus

The minimal strength stimulus needed to elicit contraction of a single muscle fiber.

Latent period

The period of time between a stimulus to a muscle and muscle response.

Muscle tone

A state of sustained, partial contraction of muscles that is necessary to maintain posture.


Refers to a decrease in the size and strength of a muscle.


The attachment of a muscle to a relatively fixed part.


The attachment to a relatively movable part.


The connective tissue that covers each muscle fiber within a fasicle.

Sarcoplasmic reticulum

The network of membranous channels in the cytoplasm of muscle fibers.

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