Which of the following statements best communicates the nature of ...

[asd123]

Which of the following statements best communicates the nature of movements in the colon?
 
  A)
  The internal and external anal sphincters control the movement of feces into and through the colon.
  B)
  Haustrations move the colon contents along with 2- to 3-minute rest periods between movements.
  C)
  Segmentation waves ensure that all surfaces of the feces are exposed to the colon surface.
  D)
  Large segments of the colon contract as a unit for around 30 seconds.

Question 2

A hospital client with a diagnosis of chronic renal failure has orders for measurement of her serum electrolyte levels three times per week.
 
  Which of the following statements best captures the relationship between renal failure and sodium regulation?
  A)
  Clients with advanced renal failure are prone to hyponatremia because of impaired tubular reabsorption.
  B)
  Renal clients often require a sodium-restricted diet to minimize the excretion load on remaining nephrons.
  C)
  Clients with renal failure often maintain high sodium levels because of decreased excretion.
  D)
  Restricting sodium intake helps to preserve nephron function and has the additional benefit of lowering blood pressure.

[mcinincha279]

Answer to Question 1

Ans:
D

Feedback:

The colon, unlike the small intestine, moves contents by the simultaneous contraction of large segments. The anal sphincters control defecation rather than movements within the colon, and haustrations perform mixing, not motility. Segmentation waves are present in the small intestine.

Answer to Question 2

Ans:
A

Feedback:

The compromised ability of the tubular nephrons to reabsorb sodium predisposes renal clients to low serum sodium levels. A sodium restriction is thus not normally indicated.

[asd123]

Excellent

[mcarey591]

TYSM