Muscle Contraction Flashcards
1
Q
What are the two important sites on the myosin head?
A
- Actin binding site
- Myosin ATPase site
2
Q
What are the four proteins the thin filament is made up of?
A
- Actin
- Tropomyosin
- Troponin
- Nebulin
3
Q
What is tropomyosin?
A
Tropomyosin blocks the myosin-binding sites on actin
4
Q
What is troponin?
A
Troponin causes tropomyosin to move away from the myosin-binding sites on actin when bound with calcium
5
Q
How is slipping prevented when muscle is contracted?
A
The myosin heads do not all go at the same time
6
Q
How does number of fibers influence force production?
A
The greater the number of fibres contracting the more force the muscle produces
