Excretion is not a part of the respiratory system.
The respiratory system includes ventilation, diffusion, and perfusion.
What do you mean by ventilation, diffusion, and perfusion in respiration?
Ventilation:
- The two components of ventilation are inspiration and expiration.
- Inspiration involves the expansion of the chest with a negative intrapulmonary pressure when air flows into the thorax.
- Expiration involves the flow of air out of the lungs when the intrapulmonary pressure is greater than the atmospheric pressure.
Diffusion:
- Gases diffuse when they go from a high-pressure region to a low-pressure region.
- This encompasses both internal and external respiration.
- Internal respiration, when gas is exchanged in internal tissues between cells and capillaries
- External respiration, when gas is exchanged between the alveoli and lung capillaries.
Perfusion:
- The blood flow to tissues and organs is referred to as perfusion.
- Capillaries provide the alveoli with blood so that carbon dioxide and oxygen can diffuse.
Learn more about the respiratory system here:
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