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18 Cards in this Set
- Front
- Back
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3 types of muscle
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skeletal: striated vol
smooth: non-striated invol cardiac: striated invol |
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periosteum
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layer of bone
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tendon
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attaching muscle to bone
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epimysium
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surrounds muscle
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perimysium
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surrounds bundles
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endomysium
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surrounds ind muscle fibers
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myoblast
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muscle fiber formed by mulit nucleated cell
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satellite cells
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stem cells
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myofibrils
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intracellular contractile elements longitudinally within msucle fiber, gives striations
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sacromere
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basic unit of contration, end ot end of sarcomere makes a myofibril. A band, H band, I band, Z line
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contraction of muscle
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I band shortens with Z lines reaching ends of A band. A band does not change in length.
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motor unit
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several muscle fibers receiving t branches of a single motor neuron
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contraction process
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actylcholine relesed from sarcolemma causing depolarization of membrane, this spreads to T tubules and causes release Ca from sarcoplasmic reticulum, triggers synchronized contraction of myofibrils in cell
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muscle tone
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tonic balance, stretch receptors, muscle spindles resp for maintaining tone through activation of spinal reflex.
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muscle spindles process
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sensory nerve monitor muscle fibers. as they lengthen they stretch because muscle relax. impulses lead to alpha motor neurons contraction. sensory gamma neurons.
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smoooth muscle
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closely packed, cell spindal shape, central nucleus, no striations, syn and secrete collagen elastin proteoglycan. autonomic inner
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cardiac muscle
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linked braching net, 1-2 central nuclei, intercalated discs: complex intercellular juncs
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types of junctions in intercalated discs
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desmosomes, adhereing, gap,
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