Kidney Nephron

Question 1

Difference between protein and other molecules in the filtrate and bowman’s capsule

Answer 1

Protein large so can’t pass through to filtrate
Other molecules found in filtrate and plasma
Because they are small so can pass through

Question 2

Why glucose concentration is 0 in bladder

Answer 2

Glucose is reabsorbed
in PCT
By active transport

Question 3

How loop of Henlé is involved in producing concentrated urine

Answer 3

Na+/Cl- pumped out of ascending limb (AL) by AT
AL is impermeable to water
Causing low WP in medulla
Loop of Henlé acts as a countercurrent multiplier
Collecting duct is permeable to water
Water exits collecting duct by osmosis

Question 4

Process occuring in PCT

Answer 4

All glucose is reabsorbed
By active transport
Urea conc rises as water is rebsorbed
Na+ absorbed a bit - conc does not increase

Question 5

Process occuring in Loop of Henlé

Answer 5

Urea conc rises
Na+ conc rises in descending limb
Water reabsorbed from descending limb
By osmosis
Na+ iom conc falls in descending limb
Na+ pumped out of ascending limb (AT)
Countercurrent multiplier

Question 6

Processes occurring in collecting duct

Answer 6

Urea and sodium conc rises
Water reabsorbed
By osmosis
ADH affects permeability