Tubular Function -PCT

Question 1

is filtration selective?

Answer 1

• no

- everything gets filtered and goes through due to starling forces

Question 2

is reabsorption selective?

Answer 2

• yes
• nutrients already reabsorbed in gut
• water also reabsorbed unless excess

Question 3

what is the apical side?

Answer 3

• brushed border

- increases S.A of each cell

Question 4

label the 5 areas the filtrate passes from

Answer 4

1. apical side
2. through cytoplasm
3. across basolateral side
4. through interstitum
5. into peritbular capillary

Question 5

what is found on the basolateral side?

Answer 5

• potassium and sodium ATPase channel

Question 6

how many sodiums are pumped out and how many potassium are taken in?

Answer 6

• 3 sodiums in exchange for 2 potassiums.

Question 7

is the conc of sodium lowered inside the cell?

Answer 7

• yes

Question 8

what happens when the sodium is pumped out?

Answer 8

• pumped out into interstitum, causing high conc there.