Which statements describe how the body maintains homeostasis on a hot day? check all that apply. 1.the nervous system and the muscular system work together. 2.the muscular system and skeletal system work together. 3.muscles make small, rapid movements to produce heat within the body. 4.sweat reaches the surface of the skin and evaporates into the air. 5.muscles underneath the skin contract, causing hair on the skin to stand up. 6.muscles underneath the skin relax, causing hair on the skin to lay flat.