Muscle contraction

Question 1

What is the sliding filament model?

Answer 1

• Action potential travels down t-tubules to sarcoplasmic reticulum.
• Ca2+ released, which binds to tropomyosin, moving troponin out of the way.
• Actin-myosin bridge forms.
• ATP binds, causing it to detach. Converted to ADP and Pi.
• Moves filament to the left. (Conformational change)

Question 2

What is creatine phosphate?

Answer 2

• Creatine phosphate acts as a reverse supply of phasphate, allowing ADP to be convertedback into ATP.