AP BIOLOGY

Detailed explanation-1: -If body temperature rises, blood vessels in the skin dilate, allowing more blood to flow near the skin’s surface. This allows heat to dissipate through the skin and into the surrounding air. The skin may also produce sweat if the body gets too hot; when the sweat evaporates, it helps to cool the body.

Detailed explanation-2: -In an effort to defend body temperature, our bodies decrease blood flow to the skin to reduce heat loss. We also increase internal heat production through several mechanisms. One example is shivering-or the rapid contraction of muscles-which can quickly produce large quantities of heat within the body.

Detailed explanation-3: -The heat in exercising muscle causes blood vessels in the skin to dilate, increasing the blood flow to the skin. The large surface area of the skin allows all the excess heat to be lost to the surrounding air. The hypothalamus in the brain is the body’s thermostat, and receptors carry it the message of excess heat.

Detailed explanation-4: -Our internal body temperature is regulated by a part of our brain called the hypothalamus. The hypothalamus checks our current temperature and compares it with the normal temperature of about 37°C. If our temperature is too low, the hypothalamus makes sure that the body generates and maintains heat.