What are the six stages of human respiration?

The six stages of human respiration include:

1. Ventilation: The process of inhaling and exhaling air to and from the lungs.
2. Gas Exchange: Oxygen and carbon dioxide are exchanged in the alveoli of the lungs.
3. Transport: Oxygen is transported via the bloodstream to tissues, while carbon dioxide is carried back to the lungs.
4. Cellular Respiration: Cells utilize oxygen to produce energy through metabolic processes, generating carbon dioxide as a byproduct.
5. Diffusion: Oxygen diffuses into cells, and carbon dioxide diffuses out into the bloodstream.
6. Regulation: The body regulates respiration rate and depth based on metabolic needs and levels of carbon dioxide and oxygen in the blood.