The proximal convoluted tubule is lined by the:
1. Simple cuboidal epithelium
2. Simple columnar epithelium
3. Simple cuboidal brush bordered epithelium
4. Simple columnar brush bordered epithelium

Identify the correct statement regarding the excretion of acids by the human kidney :
1. The filtered bicarbonate is absorbed by anion transport
2. The intercalated cells of the distal tubule secrete hydrogen ions to reabsorb bicarbonate from the tubular fluid.
3. All of the filtered bicarbonate is normally reabsorbed in the first half of the distal tubule.
4. Urine pH is normally greater than that of plasma.

Excretion of dilute urine requires

 1.   relative permeability of the distal tubule to water

 2.   transport of sodium and chloride ions out of the descending loop of Henle

 3.   the presence of ADH

 4.   impermeability of the collecting tubule to water

Describe urine in relationship to glomerular filtration tubular reabsorption and tubular secretion urine:

Removal of proximal convoluted tubule from the nephron will result in

(1) more diluted urine

(2) more concentrated urine

(3) no change in quality and quantity of urine

(4) no urine formation