Answer:
Step-by-step explanation:
page 452: Sweat glands in the skin release more sweat. The sweat evaporates removing heat energy from the skin.
Blood vessels leading to the skin capillaries become wider - they dilate - allowing more blood to flow through the skin, and more heat to be lost.
page 453: it is important to keep the flexibility because it helps from harmful things in the outside world such as moisture, the cold and sun rays, as well as germs and toxic substances.