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Alveoli is the plural of alveolus. This is the name of the microscopic air sacs in the lungs where inspired gas comes in contact with capillaries of the pulmonary circulation, allowing gas exchange between air and blood. Oxygen enters the blood and carbon dioxide leaves the blood inside the alveoli.
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∙ 11y ago
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What regulates the movement of air in and out of the lungs?
the gases flow through the two bronchi into the two lungs. the tube further divides into bronchioles which end with very thin sack like structures called alvoeli. this is where the air is filtered. oxygen gets mixed with the blood and the rest is filtered out for exit
Why alveoli in the lungs have large surface area and many blood capillaries surrounding the?
The alveoli provide large surface area for the exchange of gases between the blood and the air. Each alvoeli is surrounded by many capillaries(tiny blood vessels). The very thin walls and large surface area of the alveoli and numerous capillaries surrounding them enable gases to be exchanged quickly and efficiently. Oxygen in the inhaled air diffuses from the alveoli to the blood in the capillaries. The blook then carries the oxygen to the cells in the other parts of the body. The waste product of respiration, CO2 , diffuses from the blood to the lungs through the capillaries surrounding alveoli. It leaves the body through bronchi and trachea when you exhale( breathe out).
