Question

heat energy gained from muscle contraction is released by the ______ system. endocrine integumentary respiratory urinary cardiovascular

Explanation:

The integumentary system (skin) helps in thermoregulation. When the body gets heat from muscle contraction, the skin releases heat through processes like sweating (evaporation cools the body). The endocrine system is for hormone regulation, respiratory for gas exchange, urinary for waste and fluid balance, and cardiovascular for blood circulation. So the integumentary system is responsible for releasing heat from muscle contraction.

Answer:

integumentary