50.5 vertebrate skeletal muscle Flashcards
1
Q
vertebrate skeletal muscle
A
attached to bone
-responsible for skeletal movements
2
Q
muscle structure
A
- bundle of long fibers parallel to muscle
- each fiber is a cell
- striated muscle
3
Q
muscle fiber structure
A
contains a bundle of myofibrils
4
Q
Myofibril structure
A
repeating sarcomeres (units of microfibrils)
- consists of thin filament and thick filaments
- thin: 2 strands of actin and 2 strands of regulatory protein
- thick: staggered arrays of myosin molecules
5
Q
thin filament
A
2 strands of actin and 2 strands of regulatory protein —–attached to Z line
6
Q
thick filament
A
staggered arrays of myosin molecules
-attached to M line
7
Q
sarcomere
A
repeating units; basic contractile unit of the muscle; make the striated appearance
