According to the Henderson-Hasselbalch equation, the pH of the ...

[LCritchfi]

According to the Henderson-Hasselbalch equation, the pH of the blood will be normal as long as the ratio of HCO3 to dissolved CO2 is which of the following?
 
  a. 10:1
  b. 20:1
  c. 24:1
  d. 30:1

Question 2

Which of the following mechanisms helps to eliminate excess H+ via the kidneys? 1. Reabsorption of HCO3 2. Phosphate buffering 3. Ammonia buffering
 
  a. 2 and 3 only
  b. 1 and 3 only
  c. 2 only
  d. 1, 2, and 3

[LVPMS]

Answer to Question 1

ANS: B
Note that the pH is determined by the ratio of HCO3 to dissolved CO2, rather than by the ab-solute values of these components. As long as the ratio of HCO3 buffer to dissolved CO2 is 20:1, the pH is normal, or 7.40.

Answer to Question 2

ANS: D
After all available HCO3 ions react with H+ ions, the remaining H+ ions react with two other fil-trate buffers, phosphate and ammonia, as illustrated in Figures 13-4 and 13-5.