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25 Cards in this Set
- Front
- Back
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3 types of muscle tissue
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skeletal
smooth cardiac |
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major functions of muscle
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body movement, posture, respiration & heartbeat, thermogenosis
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properties of muscle tissue
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electrical excitability
contractility extensibility elasticity |
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ISOMETRIC CONTRACTION
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muscle develops tension does not shorten
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isotonic contraction
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tension remains constant, muscle shortens
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connective tissue
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surrounds and protects muscle tissue
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superficial fascia
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sheet of CT that seperates muscle from skin
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deep fascia
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dense irregular CT line the body wall and limbs
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epimysium
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surrounds the muscle
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perimysium
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surrounds fascicles (bundles 10-100 or more fibers)
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endomysium
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thin sheet of areolar CT that surrounds the individual muscle fiber
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sarcolemma
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plasma membrane
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T(transverse tubules)
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deep extentions of the sarcolemma into the muscle cell
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sarcoplasm
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cytoplasm contains glycogen
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myoglobin
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red pigment in the sarcoplasm that binds oxygen
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sarcoplasmic reticulum
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smooth ER store Ca ions needed for muscle contractions
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terminal cisternae
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enlarged end sacs lie on either side of the T tubule
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triad
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transverse tubule and 2 terminal cisterns
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tropomyosin
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lies in groove of helix
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covers the binding sites of myosin in a relaxed muscle
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tropomyosin
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muscle fatigue
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inability of a muscle to contract after prolonged use
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3 types of muscle fatigue
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central fatigue--common
muscular fatigue-- synaptic fatigue--very rare |
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motor unit
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motor neuron and all the muscle fibers it contacts
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muscle twitch
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contraction of all muscle fibers
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refractory period
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temporary loss of excitability
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