Wrong question pack questions Flashcards

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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

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2
Q

What is the role of ATP in myofibril contraction?

A

Breaks actinmyosin bridge
Provides energy to move myosin head

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3
Q
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