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muscular system (body movment (dorsiflexion, inversion, adduction,…
muscular system
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sliding filament theory
- Calcium binds to actin myofilament, exposing he myosin binding site
- Nerve impulse or action potential travels down the sarcolemma & into T-tubules, causing sarcoplasmic reticulm to release calcium into sarcoplasm
- Myosin attaches to actin, forming actin/myosin crossbridges
- past action is repeated many times powered by ATP
- Myosin head moves toward M line of sarcomere, pulling actin filaments past myosin
- Z lines get closer together as actin & myosin filaments slide past each other , sacromeres shorten (H zone disappears), shortening the whole myofibril
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types of muscle tissue
cardiac
cells are long, cylindrical, branched, has single central nucleus
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skeletal
cells are long, cylindrical, parallel, multinucleated
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location: chest, neck, facial region
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location: mandible, sides of head
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location: mandible, cheek area
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action: flexes neck, rotates head
location: upper chest, sternum, clavicle, 1st-6th ribs
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location: radius of arm, superior
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location: anterior compartment of forearm (top, back)
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action: all extend the knee, rectus femoris also flexes hip on thigh
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location: front, bottom of leg (shin)
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location: front bottom of leg, next to tibialis anterior muscle
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