Capillaries Flashcards
(6 cards)
1
Q
What are the three types of capillaries?
A
continuous - Moderate permeability, tight gaps
fenestrated - high water permeability
discontinuous - very large fenestration structures
2
Q
What is the glycocalyx?
A
Covers endothelium, negatively charged material
blocks solute permeation and access to transport mechanisms
3
Q
What is permeability?
A
Rate of solute transfer by diffusion across unit area membrane per unit concentration difference
4
Q
How does a porous membrane interfere with diffusion of lipid?
A
- reduction in area for diffusion
- increased path length through membrane
- restricted diffusion in pore produces hydrostatic issues
5
Q
combined, the factors that affect diffusion =
A
permeability
6
Q
rate of solute transport? (Js)
A
Js = - D A conc gradient
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