Jim does research in Antarctica. He frequently endures extremely low temperatures. Explain how his skin, muscles, and metabolism help him to maintain his body temperature. (5 points)

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.

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