Muscle Contractions Flashcards
1
Q
Z-line
A
boundary of sacromere
2
Q
M-line
A
middle of sacromere
3
Q
H-zone
A
spans the area that only contains thick filaments (H is thick)
4
Q
I-band
A
spans the area that only contains thin filaments (I is thin)
5
Q
A-band
A
spans entire thick filament no matter if there is overlap
6
Q
Muscle Contraction anatomy
A
actin slides over myosin causing Z-line to shorten
7
Q
Actin
A
thin filaments
8
Q
Myosin
A
thick filaments
9
Q
First step of muscle contraction
A
acetylcholine binds post synaptic receptor
10
Q
Second step of muscle contraction
A
influx of sodium ions form extracellular environment
11
Q
Third step of muscle contraction
A
release of calcium ions from sarcoplasmic reticulum
12
Q
Fourth step of muscle contraction
A
conformational change of tropomyosin
13
Q
Fifth step of muscle contraction
A
binding of myosin to actin
