3 Flashcards
1
Q
Complex membranous bag found in fibers
A
SR
2
Q
Function of SR
A
Store, release, resequestor Calcium
3
Q
Deep invagination in the muscle cell membrane
A
Transverse tubules
4
Q
Location of t tubules
A
On the sarcomeres (2 per sarcomere)
5
Q
Function of t tubules
A
Convey action potential to interior of fiber
6
Q
2 tubules + SR
A
Triad
7
Q
Myofibular proteins is what % of muscle composition
A
12%
8
Q
What % of myofibular protein is myosin
A
50%
9
Q
What % of myofibular protein is actin
A
25%
10
Q
What % of myofibular protein is tropomysin
A
12%
11
Q
What % of myofibular protein is troponin
A
12%
12
Q
Fastest form of myosin
A
IIb
13
Q
Functions to form fine tune speed contractions
A
Light chain
-2 of the 4 are always the same
14
Q
Splits ATP for energy
A
Myosin ATPace
15
Q
Functions to dictate gross speed of contraction
A
Heavy chain
