An interaction of systems allows for the body to warm itself when it is cold. Which processes help the body warm up when it is cold? Select three options. shivering sweating hair on body laying flat goosebumps forming hair on body standing up

Shivering, hair standing up, and goose bumps forming. When we're chilly, tiny muscles contract at the base of each hair to make them stand on end, distorting the skin to create goosebumps. All mammals share this hair-raising trait, called piloerection, of using hair or fur to trap an insulating air layer. However, shivering is the most effective way to warm up.

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