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18 Cards in this Set

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