Muscle contraction Flashcards
1
Q
Compare the thickness of the 2 filaments of muscle
A
Actin - Thin
Myosin - thick
2
Q
Describe the structure of actin
A
Made up of 2 helical strands of globular actin molecules
Fibrous protein - tropomyosin - is wrapped around the actin
Binding site present on the actin (for myosin to bind to)
3
Q
What is the antagonist muscle and what is the agonistic muscle?
A
Antagonistic - relaxes
Agonistic - contracts
4
Q
Why does a myosin head have 2 binding sites?
A
1 binding site binds to actin
1 binding site binds to ATP
5
Q
Describe the structure of myosin
A
Tail and globular head
Globular head has 2 binding sites
6
Q
What happens after Na+ ions enter the muscle cell?
A
