Question

what important traits of capillaries allow for highly efficient gas exchange in the lungs?
correct answer(s)

large number
thin walls
always have a high oxygen concentration
large surface area

incorrect answer(s)

Explanation:

Efficient gas exchange in lung capillaries relies on traits that facilitate diffusion. Large number increases total contact points; thin walls (1-cell thick) reduce diffusion distance; large surface area maximizes gas interaction. Capillaries do not always have high oxygen concentration (deoxygenated blood enters lungs).

Answer:

Correct Answer(s): large number, thin walls, large surface area
Incorrect Answer(s): always have a high oxygen concentration