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Energy used directly for muscular contraction occurs via?

User Dpedoneze
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Final answer:

The source of energy used directly for muscular contraction is ATP.

Step-by-step explanation:

The source of energy used directly for muscular contraction is adenosine triphosphate (ATP). ATP provides the energy for cross-bridge formation and filament sliding, allowing the muscles to contract.

However, ATP is not stored in large quantities in cells and must be regenerated quickly to sustain muscle contraction.

User Jernej Strasner
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