Energy supply during muscle contraction Flashcards
1
Q
When is aerobic respiration used by muscles?
A
- plentiful supply of oxygen
- long periods of low-intensity exercise
2
Q
What is the function of the tropomyosin molecule?
A
- Prevents myosin head from attaching to the binding site on the actin moleculees
3
Q
Why are calcium ions released from the endoplasmic reticulum?
A
4
Q
What does the myosin head then do after the calcium ions are released?
A
5
Q
What happens when the actin filaments moves and how does it do this?
A
6
Q
Why does ATP then attach to the myosin head?
A
7
Q
What then does the myosin head do after it has been detached~
?
A
8
Q
What happens in very active muscle?
A
- oxygen is used up more quickly than the blood supply can replace it
9
Q
What is the problem with active muscle?
A
- ATP has to be produced anaerobically
- ATP is made by glycolusis but, as no oxygen is present, the pyruvate which is also produced is converted to lactate
- this causes muscle fatigue
10
Q
What is the other way ATP is produced?
A
- using creatinbe phosphate
- ADP has tyo be phosphorylated
- Crfeatine phosphate acts as a reserve supply of phosphate
