Selective Reabsorption Flashcards
1
Q
What is selective reabsorbtion?
A
The reabsoprtion of useful substances from the glomerular filtrate back into the blood.
2
Q
Where does selective reabsorbtion occur?
A
Proximal Convoluted Tubule (PCT)
3
Q
How much of the filtrate is reabsorbed?
A
80%
4
Q
What is the water potential?
A
Filtrate is isotonic to blood.
Same osmotic pressure
5
Q
What adaptations does the PCT have to aid selective reabsorption ?
A
Convoluted - increase S.A
Microvilli - increase S.A
Mitochondria - provide ATP for active transport
Carrier Proteins - provide a route for reabsorption
Own blood supply
6
Q
What substances are reabsorbed?
A
Water, Glucose, Amino Acids/ Small Proteins
7
Q
How is sodium and glucose reabsorbed?
A
Symport Protein in the PCT
8
Q
How does the symport protein work?
A
sodium causes glucose to attach.
