To increase the effectiveness of exchange surfaces in the lungs and in the intestines, evolutionary pressures have
A)increased the surface area available for exchange.
B)increased the thickness of these linings.
C)increased the number of cell layers.
D)decreased the metabolic rate of the cells in these linings.
E)increased the volume of the cells in these linings.

Question

Quizplus · Accepted Answer

Increasing the surface area available for exchange would allow for more efficient gas exchange in the lungs and nutrient absorption in the intestines. This would increase the effectiveness of exchange surfaces in these organs. Choices B, C, D, and E are not supported by evidence and would likely decrease the effectiveness of exchange surfaces.

To Increase the Effectiveness of Exchange Surfaces in the Lungs