Answer :
Exposure to warm water like a 40.0°C hot tub induces vasodilation, resulting in increased peripheral blood flow and cooling of the body by dissipating heat.
When a person is exposed to warm water, such as immersing in a 40.0°C hot tub, their body undergoes several physiological changes to regulate its temperature. A significant response is vasodilation, where blood vessels in the skin dilate to allow more blood to flow near the surface. This helps to transfer thermal energy away from the core of the body and dissipates it into the environment. Consequently, peripheral blood flow increases, facilitating the cooling process through increased heat loss from the skin's surface. This is part of the body's homeostatic mechanisms to maintain an optimal internal temperature, which involves a delicate balance between retaining and releasing heat as necessary.
