An average adult has about 600 million alveoli.
The water in the lungs, keeps the lungs moist so they stay flexible. The O2 diffuses into the water, the water in the lungs contains a soapy surfactant which reduces its surface tension and stops the alveoli collapsing. Phagocyte (alveoli) cells are there to kill any bacteria. Concentration gradient moves from high to low pressure. this maintains a balance making it equal. When you breathe in there is more CO2 in the body than in the air. Gaseous exchange takes place to even things out. When you breathe in the diaphragm lets air in and out, the diaphragm is controlled by the nervous system. Breathing is both voluntary and involuntary, which means you can control it.
There are many millions of alveoli in each lung, and these are the areas responsible for gaseous exchange. Each alveolus is closely associated with a network of capillaries, containing de-oxygenated blood from the pulmonary artery.
The Capillary and alveolar walls are very thin, this allows a quicker exchange of gases by passive diffusion along concentration gradients. CO2 moves into the alveolus as the concentration is much lower there than in the blood, and O2 moves out of the alveolus as the continuous flow of blood through the capillaries prevents saturation of the blood with O2 and allows maximal transfer across the membrane.
CGP NOTES
The water in the lungs, keeps the lungs moist so they stay flexible. The O2 diffuses into the water, the water in the lungs contains a soapy surfactant which reduces its surface tension and stops the alveoli collapsing. Phagocyte (alveoli) cells are there to kill any bacteria. Concentration gradient moves from high to low pressure. this maintains a balance making it equal. When you breathe in there is more CO2 in the body than in the air. Gaseous exchange takes place to even things out. When you breathe in the diaphragm lets air in and out, the diaphragm is controlled by the nervous system. Breathing is both voluntary and involuntary, which means you can control it.
There are many millions of alveoli in each lung, and these are the areas responsible for gaseous exchange. Each alveolus is closely associated with a network of capillaries, containing de-oxygenated blood from the pulmonary artery.
The Capillary and alveolar walls are very thin, this allows a quicker exchange of gases by passive diffusion along concentration gradients. CO2 moves into the alveolus as the concentration is much lower there than in the blood, and O2 moves out of the alveolus as the continuous flow of blood through the capillaries prevents saturation of the blood with O2 and allows maximal transfer across the membrane.
CGP NOTES
image found www.teachpe/anatomy/gasexchange
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