What is the role of ATP in muscle contraction?

Answer 1

ATP is a source of energy in muscle contraction.

Actin filament cross bridges pull on actin molecules to cause contraction. ATPase breaks down ATP molecules when a cross bridge engages an actin molecule, providing pulling force. As the contraction progresses, more and more ATP molecules are needed to finish the contraction.

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Answer 2

William Albracht

ATP (adenosine triphosphate) provides the energy necessary for muscle contraction by fueling the cross-bridge cycling between myosin and actin filaments. When ATP binds to myosin, it undergoes hydrolysis to ADP (adenosine diphosphate) and inorganic phosphate, releasing energy. This energy is used to power the movement of myosin heads, causing them to pull on actin filaments and ultimately leading to muscle contraction. After contraction, ATP binds to myosin again, causing it to release from actin, allowing the muscle to relax.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.