Tubular Reabsorption and Secretion

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Created Nov 8, 2010
by
ericaforone

 

 
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1
Why is movement to the peritubular capillaries easy to do?
 

they have high colloid osmotic pressure

very low blood pressure due to narrow efferent...

2
Physical qualities of the PCT
 

great length

prominent microvilli

abundant mitochondria for active transport

3
Two routes of the PCT
 

transcellular-through epithelial cells of PCT

paracellular-between epithelial cells...

4
When transport proteins of cell membrane are saturated.
 
transport maximum
5
What does the PCT reabsorb?
 
Sodium, Glucose, Amino Acids, Water, Nitrogenous wastes
6
Primary function of loop of henle
 
enable collecting duct to concentrate the urine and conserve water
7
What does the loop of Henle reabsorb?
 
remaining water, 2/3 remaining Na, K, and Cl
8
The Loop of Henle recaptures ________ and returns it to the ______________.
 
NaCl, renal medulla
9
What does the descending limb of the Loop of Henle do?
 

-reabsorbs water, not salt

-concentrates tubular fluid

10
What does the ascending limb of the loop of Henle do?
 

-reabsorbs Na, K, and Cl

-maintains high osmolarity of renal medulla

-impermeable...

11
What is the role of the vasa recta?
 
countercurrent exchange system
12
What happens in the descending capillaries of the vasa recta?
 

water diffuses OUT of blood

NaCl diffuses INTO blood

13
What happens in the ascending capillaries of the vasa recta?
 

-water diffuses INTO blood

-NaCl diffuses OUT of blood

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