Where does ammonia play its most important role as a base buffer? ...

[chandani]

Where does ammonia play its most important role as a base buffer?
 
  a. Kidney
  b. Liver
  c. Lung
  d. Vasculature

Question 2

Pick the correct statement as it relates to hemoglobin and acid-base buffering.
 
  a. Deoxygenated hemoglobin acts as an acid at the tissue level.
  b. Deoxygenated hemoglobin is a fairly strong base.
  c. Hemoglobin contributes more H+ in the face of increased histidine.
  d. In an alkaline environment, hemoglobin becomes an ineffective base.

[chem1s3]

Answer to Question 1

ANS: A
Ammonia plays an important role in renal excretion of acid.

Answer to Question 2

ANS: B
The ability of proteins to accept hydrogen ions limits H+ activity in solution, which is called buffering. The ability of hemoglobin to accept (i.e., buffer) H+ ions depends on its oxygenation state. Deoxygenated (reduced) hemoglobin is a stronger base (i.e., a better H+ acceptor) than ox-ygenated hemoglobin.