Final answer:
Heat and moisture exchange is primarily a function of the lungs. They manage the water vapor and temperature regulation in the body, in addition to their main role in gas exchange.
Step-by-step explanation:
The primary function of heat and moisture exchange is carried out by the lungs. While the kidneys are known as the main osmoregulatory organ, the skin and lungs also contribute to this process. The lungs are involved in exchanging gases with the atmosphere, but they also expel a small amount of water in the form of mucous secretions and through evaporation of water vapor. In doing so, the lungs help regulate the amount of heat and moisture within the body, making them essential for maintaining homeostasis.
Other organs like the skin, liver, large intestine, and kidneys also have roles in excretion and regulation of body fluids, but specifically for the process of heat and moisture exchange, the lungs are the primary organ. This organ plays an indispensable role by managing the levels of water vapor and contributing to the thermal regulation through respiration.