renal tubular mechanisms

Question 1

absorption at proximal convoluted tubule

Answer 1

70% of K+, Na+, and H2O reabsorbed
100% glucose and amino acids

Question 2

secretion at proximal convoluted tubule

Answer 2

100% PAH

Question 3

majority of Na+ and H2O is reabsorbed in

Answer 3

proximal tubule

Question 4

luminal membrane

Answer 4

brush border membrane
- increase surface area to expand reabsorption

Question 5

is PAH completely secreted?

Answer 5

no, partially

Question 6

descending limb of loop of henle reabsorbs

Answer 6

H2O

Question 7

ascending limb of loop of Henle reabsorbs

Answer 7

Na+ and Cl-
NOT H2O

Question 8

distal convoluted tubule reabsorbs

Answer 8

Na+ and Cl-
NOT H2O

Question 9

aldosterone

Answer 9

steroid hormone
increases
- protein synthesis
- Na+/K+ pumps
- Na+ reabsorption
- K+ secretion

Question 10

antidiuretic hormone (ADH)

Answer 10

increases H2O reabsorption

Question 11

collecting duct

Answer 11

last place to change the composition of the filtrate
- fine tuning is performed by hormones

Question 12

high ADH

Answer 12

reabsorb H2O
- concentrated urine
- low urine volume

Question 13

low ADH

Answer 13

dont reabsorb H2O
dilute urine
large urine volume