What is Alveoli?What is the function of alveoli?
Answers
Answer:
Explanation:
Alveoli are tiny air sacs in your lungs that take up the oxygen you breathe in and keep your body going. Although they’re microscopic, alveoli are the workhorses of your respiratory system.
You have about 480 million alveoli, located at the end of bronchial tubes. When you breathe in, the alveoli expand to take in oxygen. When you breathe out, the alveoli shrink to expel carbon dioxide.
How alveoli work
There are three overall processes involved in your breathing:
moving air in and out of your lungs (ventilation)
oxygen-carbon dioxide exchange (diffusion)
pumping blood through your lungs (perfusion)
Although tiny, the alveoli are the center of your respiratory system’s gas exchange. The alveoli pick up the incoming energy (oxygen) you breathe in and release the outgoing waste product (carbon dioxide) you exhale.
As it moves through blood vessels (capillaries) in the alveoli walls, your blood takes the oxygen from the alveoli and gives off carbon dioxide to the alveoli.
These tiny alveoli structures taken all together form a very large surface area to do the work of your breathing, both when you’re at rest and when you are exercising. The alveoli cover a surface that measures more than 1,076.4 square feet (100 square meters).
This large surface area is necessary to process the huge amounts of air involved in breathing and getting oxygen to your lungs. Your lungs take in about 1.3 to 2.1 gallons (5 to 8 liters) of air per minute. When you’re at rest, the alveoli send 10.1 ounces (0.3 liters) of oxygen to your blood per minute.
To push the air in and out, your diaphragm and other muscles help create pressure inside your chest. When you breathe in, your muscles create a negative pressure — less than the atmospheric pressure that helps suck air in. When you breathe out, the lungs recoil and return to their normal size.
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