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WHS Urinary System 2
Tubular Reabsorption and Loop of Henle
20
Physiology
12th Grade
11/18/2010

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Term
Proximal Convoluted Tubule
Definition
Which part of the nephron does most of the tubular reabsorption of nutrients?
Term
water, and many Negatively charged ions like Cl-, PO4-, SO4-
Definition
When Na+ is actively transported back into the blood, what follows it? passively?
Term
Peritubular capillaries
Definition
What are the capillaries that surround the nephron?
Term
They move into the peritubular capillaries and then back out to the body.
Definition
When nutrients are reabsorbed, where do they go?
Term
Using energy (ATP) to move molecules against the concentration gradient.
Definition
What is active transport?
Term
The movement of water through a membrane from high to low concentration.
Definition
What is osmosis?
Term
glucose, amino acids, fatty acids, Na+, K+, some vitamins, some minerals
Definition
What nutrients are actively transported into PCT?
Term
80% of the water that was in the filtrate in the glomerular capsule
Definition
How much water is reabsorbed by the PCT?
Term
The active transport of Na+ back into the blood makes the blood very salty and sets of a concentration gradient for water.
Definition
Why does water move by osmosis in the PCT?
Term
Loop of Henle
Definition
Where is the counter current mechanisms located?
Term
Na+ and Cl-
Definition
What is pumped out of the ascending limb of the Loop?
Term
It becomes very salty.
Definition
What happens to the concentration of medullary area around the Loop?
Term
The salty medulla sets up a concentration gradient that draws water out of the Loop.
Definition
What is the purpose for pumping Na+ in to the medulla?
Term
Water reabsorption
Definition
What is the main function of the Loop of Henle?
Term
descending limb
Definition
Which part of the Loop does water leave from?
Term
ascending limb
Definition
Which part of Loop is impermeable to water?
Term
back into the blood and out to the body
Definition
Where does the water go that leaves the Loop by osmosis?
Term
They have much longer Loops to allow more time for water reabsorption.
Definition
How are the Loops of desert animals different than ours?
Term
about 1-2 Liters
Definition
How much urine is excreted/day?
Term
900L
Definition
How much blood enters the kidneys/day?
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