A by-product of involuntary muscle contraction and relaxation is?

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Multiple Choice

A by-product of involuntary muscle contraction and relaxation is?

Explanation:
Energy released during muscle activity is partly used to power movement, and the rest is dissipated as heat. Involuntary contractions, such as shivering, specifically generate heat to help maintain body temperature. Oxygen is consumed in metabolism rather than produced, lactic acid can accumulate when oxygen is limited but isn’t the universal by-product of all muscle activity, and nitrogen isn’t produced by metabolism. So heat is the by-product of involuntary muscle contraction and relaxation.

Energy released during muscle activity is partly used to power movement, and the rest is dissipated as heat. Involuntary contractions, such as shivering, specifically generate heat to help maintain body temperature. Oxygen is consumed in metabolism rather than produced, lactic acid can accumulate when oxygen is limited but isn’t the universal by-product of all muscle activity, and nitrogen isn’t produced by metabolism. So heat is the by-product of involuntary muscle contraction and relaxation.

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