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Muscle Cell

TermDefinition
sarcolemma membrane of the muscle cell
sarcoplasm cytoplasm (fluid substance within muscle cell)
myoglobin delivers oxygen for ATP synthesis and gives meat a red color
myofibrils small fibers in the sarcoplasm
sarcoplasmic reticulum stores calcium which is needed for myo contraction
filaments/myofilaments many of them make up a myofibril
3 types of proteins in fibrils contractile, regulatory, structural
contractile generated force for contraction (actin and myosin)
regulatory on the thin filaments and switches contraction on and off (tropomyosin, troponin)
structural keeps all of the parts together and links myofibrils to sarcolemma (titin, nebulin, myomesin, dystrophin)
actin thinner filament, attaches to z-disc, twisted to one another to form helix, contain myosin-binding sites,
myosin thicker filament, functions as motor protein by pushing/pulling on cellular structures to create movement, chem energy into mech energy, 2 golf clubs twisted together, heads point away from m-line
z-disc plate region that separates each sarcomere
a-band extends the length of myosin with actin overlap
i-band lighter, contains only actin
h-zone in the center of the a-band, myosin only
m-line middle of sarcomere, contains support proteins that stabilize myosin
tropomyosin blocks myosin-binding sites
troponin moves the tropomyosin to allow muscle contraction
titin large protein, anchors myosin to the z-disc and m-line, can stretch and return sarcomere to resting length
nebulin wraps around actin and anchors to z-disc
myomesin forms the m-line and binds titin
dystrophin anchors sarcomere to sarcolemma by linking actin to proteins of sarcolemma
Created by: LeannaL
 

 



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