Final answer:
The body has adaptations to counter the effects of heat stress, such as blood vessel dilation, sweat production, and increased respiration.
Step-by-step explanation:
The body has a number of adaptations to counter the effects of heat stress. When the body is hot, blood vessels in the skin dilate, allowing more blood from the body core to flow to the surface of the skin and radiate heat into the environment. Sweat glands secrete fluid, which evaporates and helps to dissipate heat from the body. Additionally, respiration increases, and a person may breathe through an open mouth instead of the nasal passageways, further increasing heat loss from the lungs.