Capillary Exchange I: Diffusion

Concept: Diffusion, Qualitatively


Concept: Fick's Law


Problem: The walls of capillaries—where all of the exchange between the blood and body takes place—are made of endothelial cells. Tight junctions are proteins that hold adjacent endothelial cells together and prevent too much from crossing. After injury, damaged cells release molecules that loosen tight junctions. Which variable in Fick’s Law is affected by injury? How will this affect flux (J)?