Explain how the organ systems work together to warm up the body on a cold day.

The blood vessels in skin will constrict, sending blood from the surface into the core.
Skeletal muscles in the trunk and limbs will contract vigorously (shivering) to produce heat that warms the body.

Sample Response: The brain, through the nervous system, sends signals to the muscular system, causing the muscles to move rapidly. This rapid motion produces heat in the body and is observed as shivering. The brain also sends signals to the muscles right beneath the skin. These muscles shorten and tighten, causing the hairs on the skin to stand up. When the hairs stand up, heat is kept in the air trapped within the hairs, which keeps the body warm.

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