Which process increases blood flow to the skin to dissipate heat?

Which process increases blood flow to the skin to dissipate heat?

• A. Vasoconstriction
• B. Vasodilation
• C. Hypertension
• D. Edema

Answer: (B)

The main concept is how the body regulates skin blood flow to control heat loss. When heat needs to be shed, the small arteries and arterioles in the skin dilate, increasing blood flow to the skin surface. This brings more warm blood to the exterior, where heat can be lost to the environment through radiation, convection, and sweating. The dilation lowers vascular resistance, allowing a larger volume of blood to reach the skin more readily. Vasoconstriction would do the opposite—narrowing the vessels and reducing skin blood flow to conserve heat. Hypertension is just high blood pressure, not a mechanism for increasing heat loss. Edema is fluid buildup in tissues, which doesn’t directly drive heat dissipation.

The main concept is how the body regulates skin blood flow to control heat loss. When heat needs to be shed, the small arteries and arterioles in the skin dilate, increasing blood flow to the skin surface. This brings more warm blood to the exterior, where heat can be lost to the environment through radiation, convection, and sweating. The dilation lowers vascular resistance, allowing a larger volume of blood to reach the skin more readily.

Vasoconstriction would do the opposite—narrowing the vessels and reducing skin blood flow to conserve heat. Hypertension is just high blood pressure, not a mechanism for increasing heat loss. Edema is fluid buildup in tissues, which doesn’t directly drive heat dissipation.