The respiratory system primarily excretes the waste gas carbon dioxide (CO2).
Here's a breakdown:
The main function of the respiratory system is to facilitate gas exchange – bringing oxygen into the body and removing carbon dioxide. The process works as follows:
- Inhalation: When you breathe in, air containing oxygen enters your lungs.
- Oxygen Absorption: Oxygen from the inhaled air moves from the lungs into your bloodstream.
- Waste Removal: At the same time, carbon dioxide (CO2), a waste product of cellular metabolism, moves from your blood into the lungs. This is according to information available as of March 24, 2022.
- Exhalation: Finally, when you breathe out (exhale), the carbon dioxide is expelled from your body.
Therefore, the respiratory system excretes waste by transferring carbon dioxide from the blood into the lungs, which is then exhaled.
