Wrong question pack questions

Question 1

During vigorous exercise, the pH of skeletal muscle tissue falls. This fall in pH leads to a reaction in the ability of Ca2+ ions to stimulate muscle contraction. Explain why

Answer 1

Low pH changes shape of calcium ion receptors
Fewer Ca2+ ions bind to tropomyosin
Fewer tropomyosin molecules move out of the way
Fewer binding sites on actin are revealed
Fewer cross bridges formed

Question 2

What is the role of ATP in myofibril contraction?

Answer 2

Breaks actinmyosin bridge
Provides energy to move myosin head