Another confusing Q

[SuperC]

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Which of the following occurs when venous blood reaches the lungs?

A. Movement of chloride ions from erythrocyte to plasma
B. Movement of bicarbonate ions from erythrocyte to plasma
C. Movement of hydrogen ions from hemoglobin to plasma
D. Movement of bicarbonate ions from plasma to erythrocyte

I was thinking (B), BUT.... What about the anion exchange in the hamburger shift? In the pulmonary capillaries HCO3 is moved into the RBC while Cl ion is moved into the plasma. Then HCO3 is converted to to CO2 by carbonic anhydrase and diffused out. This line of thought makes (A) the correct answer. Am I over thinking this?

-C

 

[sindu]

Which of the following occurs when venous blood reaches the lungs?

A. Movement of chloride ions from erythrocyte to plasma
B. Movement of bicarbonate ions from erythrocyte to plasma
C. Movement of hydrogen ions from hemoglobin to plasma
D. Movement of bicarbonate ions from plasma to erythrocyte

I was thinking (B), BUT.... What about the anion exchange in the hamburger shift? In the pulmonary capillaries HCO3 is moved into the RBC while Cl ion is moved into the plasma. Then HCO3 is converted to to CO2 by carbonic anhydrase and diffused out. This line of thought makes (A) the correct answer. Am I over thinking this?

-C

i think answer is c


rbc has hydrogenion in it , in the lungs it exchanges hydrogen ion for chloride ion, and outside hydrogen combines with hco3 and forms corbonic acid and which is again split into co2 and water and co2 is exhaled out.



any one can corrct if iam wrong

 

[SuperC]

i think answer is c


rbc has hydrogenion in it , in the lungs it exchanges hydrogen ion for chloride ion, and outside hydrogen combines with hco3 and forms corbonic acid and which is again split into co2 and water and co2 is exhaled out.



any one can corrct if iam wrong

I thought about that too... However in the pulmonary capillaries, H+ ion is is bound/used. There are 2 H+ ions bound to Hb, one Hb goes to: HCO3- and H+ --> CO2 and H2O via carbonic anhydrase. The other Binds deoxy-Hb during its conversion to Oxy-Hb.

-C

 

[monreal]

Which of the following occurs when venous blood reaches the lungs?

A. Movement of chloride ions from erythrocyte to plasma
B. Movement of bicarbonate ions from erythrocyte to plasma
C. Movement of hydrogen ions from hemoglobin to plasma
D. Movement of bicarbonate ions from plasma to erythrocyte

I was thinking (B), BUT.... What about the anion exchange in the hamburger shift? In the pulmonary capillaries HCO3 is moved into the RBC while Cl ion is moved into the plasma. Then HCO3 is converted to to CO2 by carbonic anhydrase and diffused out. This line of thought makes (A) the correct answer. Am I over thinking this?

-C

I don't know the answer, but D too makes sense

 

[SuperC]

I don't know the answer, but D too makes sense

I know! There in lies the problem... Hamburger effect says that HCO3- goes in can Cl- goes out....

 

[sabby]

its both a and d...but i think we should focus on the movement of bicarbonate, so d?

 

[anudoc]

its both a and d...but i think we should focus on the movement of bicarbonate, so d?

even i feel the answers r both A and D

 

[50 Eggs]

CJ

According to Dr. G, the answer is B), and that it's the chloride shift. Check your e-mail every once in awhile. Oh, and salty dog on friday, post-boards.