Question

Q1. What is the function of the pertitublar capillaries?

A. To secrete NA+(sodium) and H20 (water) in exchange for k+(potassium) into the tubule

B. To return deoxygenated blood to the heart and lungs

C. To secrete metabolic wastes and harmful drugs into the tubule that were not filtered at the glomerulus.

D. By reabsorbing and secretion solute and water, it modifies the original filtrate and determines the final concentration and volume of the urine.

Q2. What does NOT play a role in the transport of H20 (water) from the collecting duct.

A. Urea

B. A hyper-osmolar interstitial fluid outside the collecting duct

C. Aquaporins

D. GFR (Glomerular filtration rate)

Q3. What is the reason acidosis causes hyperkalemia?

A. This is because acidosis inactivates the Na+/K+ pump on the basolateral side of the distal Convoluted tubule.

B. This is because H+ is secreted instead of K+(potassium) in exchange for Na+ (sodium) at the distal convoluted tubule.

C. This is because acidosis inhibits the action of Aldosterone at the Distal Convoluted Tuuble.

Answer 1

1. D.

By reabsorbing and secretion solute and water, it modifies the original filtrate and determines the final concentration and volume of the urine. Other options are illogical.

2. D.

Glomerular Filtration Rate has no role in transport of H2O from collecting duct. Urea, Aquaporins, hyperosmolar interstitial fluid have role in water transport from collecting duct.

3. B.

This is because H+ is secreted instead of K+(potassium) in exchange for Na+ (sodium) at the distal convoluted tubule. Other options are irrelevant.