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Author Question: What is the limiting factor for H+ excretion in the renal tubules? a. Excessive amounts of Cl b. ... (Read 36 times)

lbcchick

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on: Jul 16, 2018
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


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ecabral0

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Reply #1 on: Jul 16, 2018
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

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Reply 2 on: Jul 16, 2018
Thanks for the timely response, appreciate it

blakcmamba

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Reply 3 on: Yesterday
Gracias!

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