ch 10 - lecture review Flashcards
epimysium
layer of collagen fibers that surrounds entire muscle and separates it from surrounding to tissues
perimysium
surrounds fascicles
endomysium
surrounds individual muscle cells
what is the organization of a muscle tissue
Myofilament
Myofibril
Muscle fiber
Fasicle
Muscle tissue
myofilament
bundles of contractile protein filaments
myofibril
collections of myofilaments that are responsible for muscle contraction
muscle fiber
muscle cell
fascicle
bundle of muscle fiber
muscle tissue
2 types of myofilament
actin (thin) and myosin (thick)
sarcolemma
plasma membrane of a muscle fiber
sarcoplasm
cytoplasm of a muscle fiber
transverse tubules (t-tubules)
narrow tubes continuous with the sarcolemma, which extend from the surface of the muscle fiber deep into the sarcoplasm
sarcomere
repeating structural and functional units of a myofibril
sarcoplasmic reticulum
tubular network similar to smooth ER that surrounds each myofibril and forms terminal cisternae
terminal cisternae
store calcium and attach to T tubules
triad
2 cisternae plus a T tubule
A bands
dark bands, which run the length of the thick filaments
subdivisions of A band
M line
H band
zone of overlap
M line
vertical line in center of A band; contains proteins that stabilize the position of the thick filaments
H band
made only of thick filaments and extends on either side of the M line
I band
light bands that contain only thin filaments
which segments in a sarcomere, shorten during contraction?
H and I bands
the 4 different types of protein that make up a myofibril.
Actin
Myosin
Tropomyosin
troponin