Question

6.3 temperature regulation (p. 197 - 8)
using the homeostatic mechanism sheet (pg.8 of inb) answer the following 2 questions:

• explain what changes occur within the skin when you have an increased body temp:
• explain what changes occur within the skin when you have an lowered body temp:

in order for sweat to properly function and cool the body, it must be removed by _______________.

Explanation:

When body temperature increases, blood vessels in the skin (vasodilation) expand to allow more blood flow, and sweat glands produce sweat which evaporates to cool the body. When body temperature decreases, blood vessels in the skin (vasoconstriction) narrow to reduce heat loss, and the arrector pili muscles contract causing goose - bumps to trap a layer of air for insulation. For sweat to cool the body effectively, it must be removed by evaporation.

Answer:

• When body temp increases: Vasodilation occurs in skin blood vessels, sweat glands produce sweat.
• When body temp decreases: Vasoconstriction occurs in skin blood vessels, arrector pili muscles contract causing goose - bumps.
• For sweat to function: Evaporation.