What is carbon dioxide?

Carbon dioxide, a waste product, passes from the blood into tiny sacs in the lungs called alveoli. The lungs then get rid of carbon dioxide when people breathe out, or exhale. The more healthy alveoli there are, the easier the air can get in and out.

Carbon dioxide is a colorless, odorless gas. It is a waste product made by the body. Carbon dioxide travels in the blood from the body's tissues to the lungs. Breathing out clears carbon dioxide from the lungs.

This answer is based on source information from the National Cancer Institute.

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