Question

3 characteristics of lungs which makes them an efficient respiratory surface

Answer 1

presence of millions of alveoli...
Having the effective way for exchange of gases...
Richly supplied with blood vessels

Answer 2

Explanation:

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.

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.

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.