The respiratory system is the anatomical system of an organism that introduces respiratory gases to the interior and performs gas exchange. In humans and other mammals, the anatomical features of the respiratory system include airways, lungs, and the respiratory muscles. Molecules of oxygen and carbon dioxide are passively exchanged, by diffusion, between the gaseous external environment and the blood.
The respiratory system removes gaseous waste such as carbon dioxide from the body. This waste is eliminated when we exhale.
by diffusion across a capillary wall
in the lungs
diffusion
The lungs
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Gas exchange occurs in the alveoli in the respiratory system. The thin-walled structures allow diffusion of gases into and out of the capillaries.
Gaseous exchange occurs in the alveoli (singular = alveolus) of the lungs.
Diffusion in the respiratory system refers to the process by which gases, such as oxygen and carbon dioxide, are exchanged between the lungs and the bloodstream. This occurs at the alveoli, where oxygen from the air diffuses into the blood and carbon dioxide from the blood diffuses into the air. Diffusion occurs because of the concentration gradient of these gases between the alveoli and the blood.
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Diffusion occurs in the respiratory system, where oxygen and carbon dioxide exchange happens in the lungs. It also occurs in the digestive system, where nutrients pass through the walls of the small intestine into the bloodstream. Additionally, diffusion takes place in the circulatory system, where gases and nutrients move between blood and tissues at the capillaries.