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Stack #39725

A&P2 Test 5 #9 Urinary-Tubular Reabsorption

QuestionAnswer
TUBULAR REABSORPTION: movement of filtrate (thru tubules) into blood of peritubular capillaries
GFR: amt of filtrate that flows out of all the glomeruli each min
Filtrate for normal adult: 180 liters (48 gal per day)
Most of the Filtrate is: reabsorbed at a rate of 123/124 mi/min (178 to 179 liters per day)
Allows body to retain nutrients? tubular reabsorption
Reabsorption mechanisms?(2) passive & active transport mechanisms
Active transport of Na+ followed by: passive transport of water molecules controls the process of Tubular reabsorbtion
As Na+ is actively transported: water follows by osmosis
Sodium ions are actively: reabsorbed into the capillaries, mostly from PC & DC tubules
Epithelial cells thru the sys of: renal tubules carry out the process of tubular reabsorption
These epithelial cells have a: BRUSH BORDER (MICROVILLI)
Brush border greatly: increases surface area
These cells also have cell membrane: specializations, incl restrictive gated channels & leak channels.
These channels selectively: remove Na+ from the capillaries & transfer it to the epithelial cells
Water follows Na+ by osmosis
The epithelial cells can then use a: system of Na+ pump channels to selectively transfer Na+ out of thier structure into the surrounding interstitial fluid.
Water again follows: the Na+ by osmosis
The process is V discriminating: and only certain materials are reabsorbed,
The material reabsorbed is: water, glucose, amino acids & ions such as:K+,Na+,Ca++, CL-, & HCO3.
Glucose is readsorbed: with an active process involving a carrier enzyme-mediated system
The carrier enzyme prob. exists: in the cells of the tubule walls
Other molecules get: reabsorbed just because they get caught in flow of water
About 80% of water is: absorbed in the PC tubules
ACTIVE TUBULAR REABSORPTION: involves the movement of glucose, amino acids, lactate, vitamins & almost all ions (such as K+ & Na+) against an electrical &/0r chemical gradient
PASSIVE TUBULAR REABSORPTION includes: diffusion, facilitated diffusion and osmosis along an electrochemical gradient
Urea, creatinine & uric acid are: by-products of nucleic acid metabolism
are by-products reabsorbed: No
 

 



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