The distances between capillaries and cell surfaces near capillaries are
A) too great for only diffusion to transport materials quickly enough.
B) so small that materials can diffuse quickly enough to move materials as needed.
C) so small that materials sometimes diffuse in the wrong direction.
D) just large enough to make transport of materials happen only one way at a time.

Question

Quizplus · Accepted Answer

The distances between capillaries and cell surfaces near capillaries are small enough that materials can diffuse quickly enough to move materials as needed. This is due to the fact that capillaries are very small and narrow blood vessels, and are located very close to body tissues. This allows for a short diffusion distance between the capillary walls and cell surfaces, enabling efficient exchange of gases, nutrients, and waste products between blood and tissues.

The Distances Between Capillaries and Cell Surfaces near Capillaries Are