The respiratory system is composed of breathing passages, lungs, and muscles of respiration; it functions to obtain oxygen from the air for cellular metabolism and to return carbon dioxide, a waste product of metabolism, to the air.

Authors

• Person: Not available Organization: Britannica
  Human body | Organs, Systems, Structure, Diagram, & Facts

Sources

• Human body | Organs, Systems, Structure, Diagram, & Facts www.britannica.com Britannica via serper

Referenced by nodes (4)

• human respiratory system concept
• oxygen concept
• lungs concept
• carbon dioxide concept