3 kidney Water Reabsorption

Question 1

What happens after selective reabsorption

Answer 1

Loop of henle creates low wp in medulla to ensure more water is reabsorbed from collecting duct –

Reabsorption of water

Question 2

1) descending limb (towards medulla)

Answer 2

Diffusion of sodium and chloride ions

Lower water potential so water moves out by osmosis

Question 3

Ascending limb (. Towards cortex)

Answer 3

Sodium and chloride ions diffuse out of lower part

Sodium and chloride ions removed by active transport

High water potential so they diffuse into descending limb

Question 4

descending limb (towards medulla)

Answer 4

Diffusion of sodium and chloride ions

Lower water potential so water moves out by osmosis and enters cappilaries

Question 5

Loop of henle

Answer 5

Arranged as counter current multiplier system

For higher transfer of mineral ions from ascending to descending to create wp gradient in medulla

Question 6

Collecting duct

Answer 6

High water poetical

Carrier fluid back down medulla, the tissue fluid in the medulla has a low water potential (decreases deeper so there’s always a gradient between fluid and collecting duct )

Water enters blood

Water moves out of collecting duct by osmosis

Urine passed down to pelvis