Muscle [Skeletal 2]

Question 1

What is this process called: channels open, depolarising the membrane, then the AP is sent through t tubules causing calcium realease, etc.

Answer 1

Excitation contraction coupling

Question 2

Lohmann reaction

Answer 2

Creatine phosphokinase does the reaction.
Transfers P from creatine to adp.
Produces ATP

Question 3

How can atp be formed from adp?

Answer 3

2ADP ——-> ATP + AMP

By adenylate kinase

Question 4

How long are the ‘ATP from creatine phosphate’ and ‘ATP from glycolysis’ respecitvely?

Answer 4

15sec

30-40sec

Question 5

2 ways that anaerobic respiration is inefficient

Answer 5

Acidification inhibits PFK reaction, which is essential for glycolysis. Lactate has to be metabolised aerobically, using even more O2 later.

Question 6

Does tension change during isotonic contraction?

Answer 6

Tension stays constant

Question 7

2 ways to control muscle tension

Answer 7

Increase frequency of number of motor units.

Question 8

Temporal summation effect on frequency and how

Answer 8

More APs before calcium can leave. This leads to temp. summation of calcium levels and the force continues to rise until a higher steady level is reached (a tetnus)

Question 9

Type 1 skeletal muscle fibres

Answer 9

Aerobic

Question 10

Type 2B Skeletal Muscle Fibres

Answer 10

Anaerobic

Question 11

Recruitment of muscle fibres

Answer 11

Small type 1 efficient - first
Big type 2 inefficient glycolysis - last

There are fewer big ones