Muscular system

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Last updated 1:50 AM on 6/22/26
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9 Terms

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overview

main function is movement

muscles generate heat

40% of the mass of body is muscle

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3 types muscle tissue

Skeletal

Smooth

Cardiac

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Skeletal

Attached to bones

Responsible for voluntary movement

Are called striated muscles meaning they are “striped”

Long parallel muscle cells

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Smooth muscles

Involuntary

Spindle shaped

Mot striated

In many internal organs and blood vessels

Contractions called peristalsis

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cardiac muscle

Only found in the heart

Striated

Branched structure

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skeletal muscle cells contain two main proteins

Thick filaments = myosin

Thin filaments = actin

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Sliding filament theory of muscle contraction

When a muscle contracts the myosin proteins attach to actin a pull on it to shorten the muscle

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tendons

Connect muscle to bone

Work like levers

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How muscles work

Work in pairs

One muscle contracts whole the other relaxes to move the body part