Muscle tissue Flashcards
1
Q
I Band consists of
A
All actin filaments
Z Line
2
Q
H Band consists of
A
All Myosin filaments
3
Q
A Band consits of
A
Actin and myosin filaments
H Band
4
Q
What change in A band, H band, I band, and Z line happens during contraction
A
- A Band: No change
- H Band: shortens
- I Band: shortens
- Z lines: move closer together
5
Q
What prevents crosslinking of actin
A
Tropomyosin
6
Q
What is Ca role in crossbridge cycle
A
Attachs to troponin and subsequent movement of tropomysoin uncovers site on actin that binds crossbridge
7
Q
What cuases dissociation of crossbridge
A
Binding of ATP
8
Q
Red fibers (Type 1)
A
- Slow contraciton
- Low ATPase activity
- Increase Capacity for aerobic metabolism
- Increase mitochondrial content
- Increased myoglobin
- Slow Red Ox
9
Q
Red fibers are used for
A
Posture-maintaing muscles
10
Q
White fibers (Type 2)
A
- Fast contraction
- Increase ATPase activity
- Increased capacity for anaerobic glycolysis
- Decrease mitochondrial content
- Decrease Myoglobin
11
Q
White fibers used for
A
Fast, short-termed, skilled motion
12
Q
Nebulin is
A
- A scaffolding protein that binds to actin filaments along their entire length and also insert into the Z line
- Serves as a template to help maintain constant length of the actin filament
13
Q
Smooth muscle contains what intermediate filaments
A
Desmin and Vimentin
other than GI: Contain Desmin but NO vimentin
