Part 3

Question 1

Urine formation processes

Answer 1

-filtration
-reabsorption
-secretion

Question 2

Filtration

Answer 2

-nonselective passive process
-water and solutes smaller than proteins are forced through capillary walls
-blood cells cannot pass out to the capillaries
-filtrate is collected in the glomerular capsule and leaves via the renal tubule

Question 3

Reabsorption

Answer 3

The peritubular capillaries reabsorb several materials
(Some Water, glucose, amino acids, ions)
-some reabsorption is passive, most is active
- most reabsorption occurs in the proximal convoluted tubule

Question 4

Not reabsorbed

Answer 4

Nitrogenous waste products
-urea
-uric acid
-creatinine
-excess water

Question 5

Secretion- reabsorption in reverse

Answer 5

Some materials move from the peritubular capillaries into the renal tubule
-hydrogen and potassium ions and creatinine
-materials left in the renal tubule move toward the ureter