List three characteristics of lungs which make it and efficient respiratory substance
Answers
1. they have millions of thin membrane alveoli whose surface area if cut and spread open can cover a complete basketball court .large surface area equates to large area for diffusion aka gaseous exchange process . so at a time in single breath large amount of oxygen supply is possible.
2. the surface is moist. one of the most important parameters for diffusion to be possible.
3. it has got direct connection to blood and blood vessels ; so blood has to go nowhere else to get oxygen
hope it helps
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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.
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