Excretory system Knowledge-Based Download PDF

Questions

1. 1.

   During urine formation, which process selectively transfers substances such as potassium ions, hydrogen ions, ammonium, and certain drug metabolites from the peritubular capillaries into the renal tubular fluid?

   • A) Glomerular filtration
   • B) Tubular reabsorption
   • C) Countercurrent multiplication
   • D) Tubular secretion
2. 2.

   Which specialized cells located in the distal tubule monitor the sodium chloride concentration of the tubular fluid and regulate the secretion of renin by juxtaglomerular cells?

   • A) Macula densa cells
   • B) Podocytes
   • C) Extraglomerular mesangial cells
   • D) Principal cells
3. 3.

   Which hormone is released by the posterior pituitary to increase water permeability in the renal collecting ducts by promoting the insertion of aquaporin channels into the apical membrane?

   • A) Aldosterone
   • B) Atrial natriuretic peptide
   • C) Parathyroid hormone
   • D) Antidiuretic hormone
4. 4.

   Which segment of the nephron is highly permeable to water but virtually impermeable to solutes such as sodium chloride, thereby concentrating the tubular fluid as it moves into the renal medulla?

   • A) Thick ascending limb of the loop of Henle
   • B) Descending limb of the loop of Henle
   • C) Distal convoluted tubule
   • D) Macula densa
5. 5.

   Which of the following substances is freely filtered across the glomerular capillaries into Bowman's capsule and completely reabsorbed under normal physiological conditions along the proximal convoluted tubule?

   • A) Glucose
   • B) Urea
   • C) Albumin
   • D) Creatinine