Where does the majority of sodium reabsorption take place? a. ...

[dmcintosh]

Where does the majority of sodium reabsorption take place?
 
  a. Proximal tubule
  b. Loop of Henle
  c. Distal tubule
  d. Collecting duct

Question 2

When the nurse is discussing the sodium-sensing cells of the glomerulus, what term should the nurse use?
 
  a. Podocytes
  b. Macula densa
  c. Mesangial cells
  d. Loop of Henle

[cclemon1]

Answer to Question 1

ANS: A
The majority of sodium reabsorption takes place in the proximal tubule. The majority of sodium reabsorption is not associated with the loop of Henle, the distal tubule, or the collecting duct.

Answer to Question 2

ANS: B
The macula densa are sodium-sensing cells. The epithelium has specialized cells called podocytes from which pedicles (foot projections) radiate and adhere to the basement membrane. Mesangial cells lie between and support the capillaries. Mesangial cells have phagocytic ability similar to that monocytes, release inflammatory cytokines, and can contract to regulate glomerular capillary blood flow. The loop of Henle is where fluid reabsorption occurs.