The Distances Between Capillaries and Cell Surfaces near Capillaries Are

Multiple Choice

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.