Final answer:
Carbon dioxide is expelled from the body through exhalation.
Step-by-step explanation:
In the human body, carbon dioxide is primarily transported out of the body through exhalation, or the act of breathing out. When we inhale, oxygen enters our lungs and is then transported to different cells in the body. As cells carry out metabolism, they produce carbon dioxide as a waste product. This carbon dioxide then diffuses into the bloodstream and is transported back to the lungs. Finally, during exhalation, the carbon dioxide leaves the body as we breathe out.
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