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Question

To balance the bicarbonate ion loss from RBC, the chloride ions move into RBC; it is known as

A
Chloride shift
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B
Hamburger phenomenon
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C
Bohr effect
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D
Both A and B
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Solution

The correct option is D Both A and B
Red blood cell membranes are impermeable to hydrogen ions but are able to exchange bicarbonate ions for chloride ions. A rise in intracellular bicarbonate causes chloride intake and bicarbonate export. The term chloride shift refers to this exchange. As a result, blood chloride concentration is lower in systemic venous blood than in systemic arterial blood or in pulmonary circulation because the levels of CO2 and therefore bicarbonate are higher in systemic venous blood, providing less of a driving force for exchange.

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