How Does Gaseous Exchange Occur in the Alveoli?


Gaseous exchange occurs in the alveoli by a process called diffusion, which occurs between the surface of alveoli and pulmonary capillariesi. Oxygen, once inhaled into the lungs, is passed from the alveoli into the bloodstream for distribution to the rest of the body. Afterwards, carbon dioxide, a waste product from the oxygen broken down in the cells, is carried by blood back to the capillaries, where it diffuses through the walls of the alveoli, and is breathed out during exhalation.
Q&A Related to "How Does Gaseous Exchange Occur in the Alveoli"
Alveoli have a large surface area made of cells 1 cell thick, this makes it easy for the gases to 'exchange' into the surrounding cappilaries which are also 1 cell thick.
Air from the atmosphere passes through the conducting airway until it reaches the alveoli. The walls of the alveoli are only one cell thick and this is called the respiratory surface
Oxygen diffuses from the alveoli into the blood stream, to be transported around the body, while carbon dioxide is diffused the other way, to be expelled from the body by breathing.
Oxygen transport and exchange occurs at
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