How does the body react to an increase in external temperature?

How does the body react to an increase in external temperature?

• A. By initiating shivering
• B. By performing vasoconstriction
• C. By sweating or vasodilation
• D. By increasing heart rate

Answer: (C)

When the body experiences an increase in external temperature, the main physiological responses include sweating and vasodilation. Sweating is a cooling mechanism where sweat glands produce moisture on the skin's surface, which evaporates and leads to a decrease in body temperature. This process is vital for thermoregulation, allowing the body to release excess heat. Vasodilation, on the other hand, is the widening of blood vessels, particularly near the surface of the skin. This increased blood flow to the skin allows for greater heat dissipation, as warm blood from the core is directed to the periphery, enhancing heat loss through radiation and convection. These combined mechanisms help the body effectively lower its core temperature and maintain homeostasis in hot conditions.

When the body experiences an increase in external temperature, the main physiological responses include sweating and vasodilation. Sweating is a cooling mechanism where sweat glands produce moisture on the skin's surface, which evaporates and leads to a decrease in body temperature. This process is vital for thermoregulation, allowing the body to release excess heat.

Vasodilation, on the other hand, is the widening of blood vessels, particularly near the surface of the skin. This increased blood flow to the skin allows for greater heat dissipation, as warm blood from the core is directed to the periphery, enhancing heat loss through radiation and convection. These combined mechanisms help the body effectively lower its core temperature and maintain homeostasis in hot conditions.