The small size, coupled with the vast amount of alveoli - means that the body can absorb much more oxygen than if our lungs were simply two huge 'empty bags'. The surface area is far greater in our lungs because of the number of alveoli.
Alveoli are small to maximize their surface area, allowing for efficient gas exchange in the lungs. There are approximately 300 million alveoli in the lungs, making them too numerous to count individually without specialized equipment. Their small size and vast number help to increase the lungs' capacity for oxygen uptake and carbon dioxide removal.
They absorb so much oxygen because of the Alveoli. An Alveoli are the endings of small tubes that are located in your lungs and transfer oxygen to your capillaries.
The small sacs at the end of the Bronchial tubes are called the anus.PL77 * erm i think you have the wrong organ system, that is the end of the digestive system bronchial tubes are in the respiratory system and the small sacs attached to the bronchial tubes are called alveoli they are air sacs in the lungs*
the paouch like air secs at the smallest lenchioles is called alveoli.the walls of alveoli are very thin and they are sorrounding thin blood capllaries .it is in alveoli exchange of gaseouse takes place there are so many alveoli in blood so they provides very larges surface srea for cxchanges of gaseouse
C02:alveoli
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alveoli are tiny branches of the lungs where blood travels to be oxygenated so it is useful to the rest of the body.
Alveoli are surrounded by capillaries so that the oxygen can diffuse into the blood and carbon dioxide can diffuse out. I think it depends on the shape of the alveoli to the path of the capillary.
air exchange takes place at the juction of blood cappileries and alveoli where the pressure of air is high in alveoli and low in blood so air from alveoli rush into blood and CO2 from blood rush in to alveoli which is then breath out
Oxygen diffuses from the alveoli into the blood because of a concentration gradient. The partial pressure of oxygen in the alveoli is higher than in the blood, so oxygen moves across the thin membrane of the alveoli into the blood to reach equilibrium.
A plant has so many cells, they are uncountable.