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muscle tissue

lab final

QuestionAnswer
Fascicle Group of muscle fibers surrounded by the perimysium
epimysium A connective tissue sheath covering a whole muscle
perimysium Connective tissue sheath surrounding each fascicle
sarcolemma The plasma membrane of a skeletal muscle fiber
sarcoplasm A modified smooth endoplasmic reticulum that wraps around the myofibrils and stores calcium ions
endomysium Extracellular matrix surrounding muscle fibers
myofibrils, Rodlike bundle of contractile filaments found in muscle fibers
terminal cisternae Point at which the sarcoplasmic reticulum swells where it meets a T-tubule
T-tubule An extension of the sarcolemma that dives into the muscle fiber and surrounds myofibrils
troponin protein in thin filament
tropomyosin protein in thin filament
myosin protein in thick filament
A bands Dark regions of the striations in skeletal muscle tissue that consist of thick and thin filaments or thick filaments only
I bands Light regions of the striations in skeletal muscle tissue that consist of thin filaments only
H zone The lighter region in the midsection of each A band that consists of thick filaments only
Z disk Line consisting of different proteins that bisects the I band
1st step in sliding filament mechanism ATP is hydrolyzed, cocks the mysoin molecule
2ncd step in sliding filament mechanism Actin binds the the myosin head forming a crossbridge
3rd step in sliding filament mechanism ADP and P dissociate from the myosin head, as it moves it pulls the actin strand in a motion known as power stroke
4th step in sliding filament mechnism A new ATP molecule binds to myosin which causes actin and myosin to dissociate. ATP hydrolyzes again (starts over)
Smooth muscle not striated, long and thin cells, involuntary
Cardiac muscle striated, intercalated disks, short branching cells,
Skeletal muscle striated, multiple nuclei,
Created by: rdgostp8
 

 



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