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20 Cards in this Set

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filtration
the movement of molecules from the blood plasma in the glomerulus to the Bowman’s capsule, the 1st part of a nephron.
glomerulus
Filtration is produced by pressure gradients across the __________ membrane.
Filtrate
________ is essentially the same composition as plasma, but lacking proteins.
reabsorption
movement of molecules from the nephron tubules back into the peritubular capillaries.

There were filtered out & they got back in
secretion
movement of molecules from the peritubular capillaries into the nephron tubules.
renal exchange process
• Filtration – the movement of molecules from the blood plasma in the glomerulus to the Bowman’s capsule, the 1st part of a nephron.
• Filtration is produced by pressure gradients across the glomerulus membrane.
• Filtrate is essentially the same composition as plasma, but lacking proteins.
• Reabsorption – movement of molecules from the nephron tubules back into the peritubular capillaries.
o There were filtered out & they got back in
• Secretion – movement of molecules from the peritubular capillaries into the nephron tubules. (585)
GFR
• The amount of filtrate produced at all the nephrons per minute. Equals about 125ml/min.
• 180 liters/day
o How? There are 3 processes. Filtration is just 1 of them.
• Urine volume – 1 to 1.5 liters/day
• Why is so much filtrate produced?
• A major nephron function is the removal of nitrogenous wasters, primarily urea from the plasma.
• Producing a large volume of filtrate will remove large amounts of urea.
• Must put most of water back into bloodstream by reabsorbing the water.
• Filtration process allows for the removal of large amounts of urea from the plasma & the concentration of that urea into small volume of water (urine).
GFR
The amount of filtrate produced at all the nephrons per minute. Equals about 125ml/min.
• 180 liters/day
nephron
A major _______ function is the removal of nitrogenous wastes, primarily urea from the plasma.
filtrate
Producing a large volume of _________ will remove large amounts of urea.
reabsorbing
Must put most of water back into bloodstream by __________ the water.
Filtration
___________ process allows for the removal of large amounts of urea from the plasma & the concentration of that urea into small volume of water (urine).
reabsorption
• Since such a high volume of filtrate is produced per day most all of what was filtered must be put back into the bloodsteam.
active transport
• At the proximal convoluted tubule 100% of all the nutrients filtered are reabsorbed back into the bloodstream (via peritubular capillaries). Use _______ _________ to move the nutrients.
nonregulated reabsorption
• About 70% of all of the electrolytes & water are also reabsorbed from the proximal convoluted tubule. Is basically automatic so is called ____________ ___________.
loop of Henle
• A small (approximately) 20% of salts & water are reabsorbed from the _____ ___ _____.
HORMONES
regulated reabsorption
• At the distal convoluted tubule & collecting tubule the amount of salt & water reabsorption is controlled by the action of ________. This is called ________ __________ because how much is actually happening can vary over time.
active transport
passive process (diffusion)
• Usually, most + ions are reabsorbed through ______ ________ processes while most – ions & water are reabsorbed by ________ ________ _________.
peritubular capillaries
nephron tubules
• Usually an active transport process that moves molecules from the ___________ __________ into the _______ _______ usually at the distant convoluted tubules or collecting tubules.
secretion
Provides nephrons with a 2nd way to remove unwanted molecules from the plasma.

What the 1st way? Filtration