Perspiration

Perspiration is the production and release of sweat from the skin. Its evaporation cools the body, while sweat also carries small amounts of dissolved substances out of the body.

Eccrine sweat gland: A coiled skin gland that releases watery sweat onto the skin surface. These glands provide most thermoregulatory sweating across the body.
Sweat: A watery secretion produced by sweat glands and released onto the skin or into hair follicles. Perspiration is the process; sweat is the fluid it produces.
Heat illness: A range of conditions caused by excessive heat exposure or impaired heat dissipation. Heavy sweating can accompany heat stress, while impaired sweating can worsen overheating.
Vasodilation: Widening of blood vessels that increases blood flow through them. Skin vasodilation often works alongside sweating to transfer core heat to the surface.
Apocrine sweat gland: A skin gland that releases a thicker secretion into hair follicles, mainly in the armpits and groin. Apocrine secretion differs from the watery sweat that cools the body.
Skin: The body's outer covering, forming a barrier and interacting with the environment. Sweat reaches the environment across the skin's surface.
Dehydration: A state in which the body has lost more water than it has taken in. Sweat loss contributes to dehydration during prolonged heat or exertion.
Vasoconstriction: Narrowing of blood vessels that reduces blood flow through them. It conserves heat, opposing the skin heat loss commonly paired with sweating.
Hypothalamus: A brain region that regulates homeostasis, including body temperature. It coordinates sweating when internal temperature rises.
Latent heat of vaporization: The energy required to change a liquid into a gas without changing its temperature. This energy comes largely from the skin when sweat evaporates.

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SweatingRelated: The near-synonym is also used for moisture from sources other than active sweat-gland secretion.