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What is carbon dioxide?

Dr. Jeanne Morrison, PhD
Family Practitioner

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.

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.

Continue Learning about Parts of the Respiratory System

Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.