1. Most material exchange occurs across capillary walls. What are typical mechan
ID: 181813 • Letter: 1
Question
1. Most material exchange occurs across capillary walls. What are typical mechanisms of material transfer across capillaries?
a) Fick’s First Law, Fick’s Second law, Poiseuille’s
b) Fick’s second, Poiseuilles, Endocytosis
c) Ficks Second, Poiseuilles, Transyctosis
d) Ficks first, poiseilles, Endocytosis
e) Fick’s First Law, Poiseulle’s, Transyctosis
2. At very low flow rates, the concentration of a diffusible metabolite within a capillary
a) approaches 0
b) increases for all time
c) approaches the interstitial concentration of the metabolite
d) approaches the rate of metabolism of the metabolite Qm, divided by E
Explanation / Answer
1. Answer: e) Fick’s First Law, Poiseulle’s, Transcytosis
Fick's 1st law - Diffusion coefficient is dependent on the membrane permeability/extracellular fluid that is present on the outside the cell.
poiseulle's law- pressure drop in an incompressible and Newtonian fluid the velocity of the fluid neared to the wall decrease, so slowing down of velocity increases the rate of diffusion through the capillary.
Transcytosis- transcellular transport in which various macromolecules are transported across the interior of a cell.
2. approaches the rate of metabolism of the metabolite Qm, divided by E
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