Wrong question pack questions Flashcards
1
Q
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
A
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
2
Q
What is the role of ATP in myofibril contraction?
A
Breaks actinmyosin bridge
Provides energy to move myosin head
3
Q
A
