Biology/muscle

23 terms by Jen-e 

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Chemical

The kind of energy that muscles use to contract.

Fascia

An individual skeletal muscle is separated from adjacent muscles.

Tendons

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.

Sarcormeres

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.

Acetylcholine

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

ATP

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.

Calcium

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.

Atrophy

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

Orgin

The attachment of a muscle to a relatively fixed part.

Insertion

The attachment to a relatively movable part.

Endomysium

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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