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31 Cards in this Set

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What are the 3 types of muscles?
skeletal-voluntary, cardiac-invol.,smooth-invol.
2 proteins that the muscle is composed of:
actin and myosin
this covering surrounds the whole muscle and is made from dense irregular
epimysium
a group of muscle fibers, inside of these is muscle cells or fibers
fascicle
this covers around fasicle?
perimysium
long cylindrical, multinucleate found within the fascicle
muscle fiber or cell
plasma membrane of muscle fiber
sarcolemma
this is the cytoplasm of muscle
sarcoplasm
this is a structure within the muscle fiber and is made from actin and myosin
myofibrils
connective tissue that surrounds each muscle fiber
endomysium
each muscle contains a ____ and a ____ each entering and exiting at the same place
nerve and artery/veins
these are contorted when muscle is relaxed or contracted
capillaries
when ____ the muscle shortens
when____ the muscle is long
contracted
relaxed
these are sticks of protein
myofibrils
which band is thicker A band or I band
A band
this band changes during contraction
I band
this zone is lighter strip in middle of A band...relaxed muscle only
H zone
this line bisects H zone and A band
M line
this disc bisects I band
Z disc
this is the region between Z disc
sarcomere
the thick filaments form the length of the __ band
A
the thin filametns form the length of the __ band
I
this protein forms the Z disc, anchors thin filaments
nebulin
fine protein strands that form M line, hold adjacent thick filaments together
desmin
this protein has two heads and 2 twisted tails
myosin
the heads have two purposes what are they?
bind w/ actin
ATP
has a twisted double strand and stiffened by two strands of tropomyosin-blocks active site for myosin
actin
Tropomin has three proteins that make it up what are they and what does each one do?
TnI-bonds actin
TnC-binds calcium ions
TnT-binds to tropomyosin and positions it on actin
this surrounds each myofibril, network of tubules,terminal cisternea
sarcoplasmic reticulum
terminal cisternea releases
Ca
these are wrapped around each myofibril and conduct nerve impulses
t-tubules or transverse tubules