ASCP MLS Urinalysis and Body Fluids Exam Questions with Correct Verified Answers

Which statement regarding renal function is true? A. Glomeruli are far more permeable to H2O and salt than other capillaries B. The collecting tubule reabsorbs sodium and secretes potassium in response to antidiuretic hormone (ADH) C. The collecting tubule is permeable to H2O only in the presence of aldosterone D. The thick ascending limb is highly permeable to H2O and urea - ANSWER A. The formation of plasma ultrafiltrate depends upon high hydrostatic pressure and permeability of the glomeruli. Aldosterone is released when afferent arterial pressure falls, and ADH is released when plasma osmolality becomes too high. The collecting tubule reabsorbs sodium and secretes potassium in response to aldosterone, and is permeable to H2O only in the presence of ADH. The thick ascending limb is permeable to salt, but not to H2O or urea.