Contraction of Skeletal Muscle Fibers Flashcards
1
Q
contracting muscles…
A
pull on tendons to produce movement
2
Q
tenson develops in muscles when…
A
sarcomeres shorten
3
Q
how do sarcomeres shorten?
A
thick filaments attach to thin filaments and pull them toward the centers of the sarcomeres (sliding filament theory)
4
Q
sliding filament theory
A
- thin filaments slide past thick filaments during contraction
- Z discs move closer together so sarcomeres shorten
- widths of A bands remain constant, but H zones disappear
- I bands narrow
5
Q
do lengths of filaments change?
A
no, only their relative position
