Alveoli are the terminal air sacs of the lungs, and are the sites of gas exchange between the lungs and blood. how does the surface area-to-volume ratio of the cells of alveolar walls relate to their function? hurry.

imagine a line passing through the center of earth that goes through both the north pole and the south pole. this imaginary line is called an axis. earth spins around its axis, just as a top spins around its spindle. this spinning movement is called earth's rotation. at the same time that the earth spins on its axis, it also orbits, or revolves around the sun. this movement is called revolution.