Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
17 Cards in this Set
- Front
- Back
|
skeletal muscle appearance
|
large, uniform diameter, striated, multinucleated with peripherally located nuclei
|
|
|
skeletal muscle location
|
skeletal muscle
tongue diaphragm pharynx |
|
|
each muscle fiber is surrounded by
|
external lamina (basement membrane)
|
|
|
satellite cells
|
inactive my blasts inside the external lamina that form new muscle fibers
|
|
|
myofibril
|
think and thin filaments seperated by sarcoplasmic reticulum, mitochondria, and glycogen granules
|
|
|
A band
|
dark band of thick filament, myosin
|
|
|
I band
|
light band of thin filaments, actin, tropomyosin. and troponin
|
|
|
z line
|
locsted at center of I band
anchors thin filaments |
|
|
M line
|
located at cebter of A band
anchors thick filaments |
|
|
H zone
|
lighter staining area on either side of M line
area of no overlap between thick and thin filaments area of thick filaments only |
|
|
sarcomere
|
functional unit of contraction extending from one z line to the next
2-3um long in relaxed muscle |
|
|
thick and thin filaments overlap in...
|
A band (except H zone)
|
|
|
hexagon array
|
each thick filament is surrounded by 6 thin filaments
(by weight 4:1) |
|
|
cross bridges
|
ATPase side arms that contact thick filaments to thin filaments
|
|
|
thick and thin filaments do NOT
|
shorten
|
|
|
areas in relaxed muscle with no filament overlap decrease in width are
|
i band and h zone
|
|
|
When the sarcomere shortens the z lines
|
Are pulled closer together
|
