M2 L10 Flashcards
(12 cards)
1
Q
what are 3 types of muscle
A
smooth, cardiac, skeletal
2
Q
what is the order of muscle organisation
A
myofibril -> fibre -> fascicle
3
Q
muscle nuclei
A
- multiple from fused cells
- on the periphery of the cell
4
Q
contractile units of muscle
A
sarcomere
5
Q
dark band in light region
light band in dark region
A
Z disc
M line
6
Q
ratio of actin to myosin in sarcomeres
A
2 actin filament: 1 myosin filament
7
Q
actin
A
- globular actin each have an active site
- linear actin or fibrous
8
Q
tropomyosin
A
thread like along actin surface
- each covers 7 actin active sites
9
Q
troponin
A
complex of 3 globular proteins
- I affinity for actin
- T affinity for tropomyosin
- C affinity for calcium
10
Q
other proteins
A
a - actinin
- primary Z line comp
titin
- core of thick filament that recoils
- binds myosin to Z disc
nebulin
- act as actin length determiner
11
Q
thin myofilaments
A
- actin
- troponin
- tropomyosin
12
Q
thick myofilament
A
myosin
