musculoskeletal system muscles. types skeletal – forms the muscles attached to the skeleton - move...

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MUSCULOSKELETAL SYSTEM Muscles

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MUSCULOSKELETAL SYSTEM

Muscles

TYPES

Skeletal – forms the muscles attached to the skeleton

- move the limbs and other body parts

- long striated

- subject to voluntary control

- make up the muscular system

TYPES

Smooth

- spindle shaped and arranged in opposing layers

- located in the walls of hollow organs

-When they contract substances ( ex…) are moved along the pathways

-involuntary

TYPES – CONT’D

Cardiac muscles

- striated, branching cells

- fit closely together in spiral bundles in the heart

- contraction pumps blood through the vessels

- involuntary

- sole function of muscle tissue is to contract or shorten.

- contraction causes movement

- maintains posture

- stabilizes joints

- and generates heat.

All skeletal muscle cells are stimulated by motor neurons

- most skeletal muscle contractions are smooth and sustained because rapid nerve impulses are reaching the muscle and the muscle cannot relax completely between contractions

- strength of muscle contraction reflects number of cells contracting ( more = stronger)

ATP is the source of energy for muscle contraction

- ATP stored in the muscles is used up with in seconds of activity

- must continually be restored.

FAST TWITCH MUSCLE FIBRES -Contract quickly, get tired quickly

SLOW TWITCH MUSCLE FIBRES - contract slowly but last longer

- “Dark Meat” -

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TENDONS

Dense fiborous tissue that attaches muscle to bone.