Question

1) List three characteristics of lungs which make them an efficient respiratory surface

Answer 1

Three characteristics of the lungs which makes them an efficient :-
-They have rich blood supply
-Their inner surface is moist 
-They have large combined surface area

Answer 2

Answer: The three characteristics of lungs that make them an efficient respiratory surface are-

1) Large surface area - Lungs have large number of alveoli that increases the surface area required for exchange of gases.

2) Thin walls - There is single layer of cells present in the alveolar wall that provides gases a short diffusion distance.

3) Extensive blood supply - There is extensive blood supply in the lungs, which ensures that oxygen rich blood is drawn away from the lungs and blood rich in carbon dioxide is sent to the lungs.