3.6.3 skeletal muscles as effectors Flashcards
1
Q
Describe the role of ATP in muscle contraction
A
- Hydrolysis of ATP (on myosin heads) causes myosin heads to bend;
- (Bending) pulling actin molecules;
- Attachment of a new ATP molecule to each myosin head causes myosin heads to detach (from actin sites);
2
Q
Describe the role of Ca ions in muscle contraction
A
- Calcium ions diffuse into myofibrils from (sarcoplasmic) reticulum;
- (Calcium ions) cause movement of tropomyosin (on actin);
- (This movement causes) exposure of the binding sites on the actin;
- Myosin heads attach to binding sites on actin;
3
Q
role of glycogen in skeletal muscle?
A
- As a store of glucose
OR
To be hydrolysed to glucose; - For respiration/to provide ATP;