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(A) In the lungs,the process is the reverse of the chloride shift (Hamburger phenomenon) that occurs in the tissues. At the level of the lungs,the par

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Chloride ions from $RBC$ to plasma

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(A) In the lungs,the process is the reverse of the chloride shift (Hamburger phenomenon) that occurs in the tissues. At the level of the lungs,the partial pressure of $CO_2$ is low. $HCO_3^-$ ions move from the plasma into the $RBC$ to combine with $H^+$ ions to form $H_2CO_3$,which then dissociates into $H_2O$ and $CO_2$ to be exhaled. To maintain electrical neutrality,$Cl^-$ ions move from the $RBC$ back into the plasma. Therefore,the movement involves chloride ions moving from $RBC$ to plasma.

In lungs,in order to facilitate the removal of $CO_2$ from the blood,there is an exchange of ions between $RBC$ and the plasma which involves the movement of:

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