What is the limiting factor for H+ excretion in the renal ...

[lbcchick]

What is the limiting factor for H+ excretion in the renal tubules?
 
  a. Excessive amounts of Cl
  b. Excessive amounts of HCO3
  c. Insufficient buffers
  d. Insufficient sodium

Question 2

The numerator of the Henderson-Hasselbalch (H-H) equation (HCO3) relates to which of the following?
 
  a. Blood concentration of nonbicarbonate buffers
  b. Excretion of volatile acid by the lungs
  c. Renal buffering and excretion of fixed acids
  d. Respiratory component of acid-base bal-ance

[ecabral0]

Answer to Question 1

ANS: C
When filtrate pH falls to 4.5, H+ secretion stops. Buffers in the tubular fluid are essential for the secretion and elimination of excess H+ ions in acidotic states.

Answer to Question 2

ANS: C
Because the kidneys control blood HCO3 and the lungs control blood CO2 levels, the H-H equation can be conceptually rewritten as follows:
PH  kidneys/lungs.

[lbcchick]

Great answer, keep it coming

[bassamabas]

Thanks for the timely response, appreciate it