List three characteristics of lungs which make it an efficient respiratory surface
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Three Characteristics Of Lungs Which Make Them An Efficient Respiratory Surface Are:
1.They Have A Rich Blood Supply.
2.Their Inner Surface Is Moist.
3.They Have Large Combined Surface Area.
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These features which particularly make our lungs efficient for gas exchange.
1.Thin: the air sac walls are very thin so that gases can quickly diffuse through them. Oxygen is absorbed in to the blood and carbon dioxide is given out in to the lungs to be exhaled out.
2.Moist: the air sacs are moist with mucus so that gases can dissolve before diffusing.
3.Large surface area: the surface area for gases to diffuse through in human lungs is roughly the same as a tennis court. The alveoli help to increase the surface area for absorption of oxygen.
4.Good blood supply: the air sacs or the alveoli have a large capillary network so that large volumes of gases can be exchanged. More the flow of blood more exchange.