Question

how do the muscles help in thermoregulation?
muscles produce oil that burns in the presence of oxygen
muscles undergo a chemical reaction that absorbs heat.
muscles break down carbon dioxide, producing heat.
muscles contract rapidly, producing heat.

Explanation:

Muscles help in thermoregulation by contracting rapidly, which is a form of shivering. Shivering generates heat to maintain body - temperature. Muscles do not produce oil for burning in oxygen for thermoregulation, do not undergo heat - absorbing reactions for thermoregulation, and do not break down carbon dioxide to produce heat.

Answer:

Muscles contract rapidly, producing heat.