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Muscular System (Parts of muscles (Synapse- connections between nerves…
Muscular System
Parts of muscles
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Motor end plate- region across synaptic cleft from end bulb(muscle fiber); contains many receptors for ach
Fatigue- muscle looses its ability to contact during strenuous exercise; arises from electrolyte imbalances and decreased ATP levels
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Bursae- synovial-lined sacs containing synovial fluid; located between some tendons & underlying bones
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Layers of connective tissue around each whole muscle is called epimysium; the perimysium surrounds individual bundles wishing each muscle; each muscle cell covered connective tissue layer endomysium
Muscle structures
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Bursae- synovial-lined sacs containing synovial fluid; located between some tendons & underlying bones
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Portion of myofibril=contain thick and thin filaments
Muscle fiber contains connective tissue called endomysium
Muscle fiber is muscle cell
Contains membrane called sarcolemma
Sliding filament theory
- Nerve impulse or action potential travels down sarcolemma and into t-tubules, causing sarcoplasmic reticulum to release Ca++ into sarcoplasm
- Myosin head attaches to actin, forming actin/myosin crossbridges
- Myosin head moves toward Mline
- Ca++ binds to actin myofilament, exposing the myosin binding site
Muscle contraction
- Nerve impulse releases ach
2.Ach diffuses across synaptic cleft, and binds with receptors on motor end plate
- This causes receptor to change shape and open Na+ channels in sarcolemma
- Electrical current, causes actin potential(muscle contraction)
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Muscle contractions
Motor neuron - nerve cell stimulates skeletal muscle ; 1 motor neuron may stimulate many muscle cells
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Motor unit- made of 1motor neuron & all muscle fibers it innervates; these cells all contract together; muscle must stimulate by a nerve to contract
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