alleryStart learning →Which ion is the predominant anion of the extracellular fluid?
AChloride
BPhosphate
CBicarbonate
DPotassium
Answer & Solution
Correct answer: A. Chloride
1. Anions are negatively charged ions, and they must balance the cations in a fluid.
2. Chloride is the predominant anion of the extracellular fluid.
3. It balances the cations there and keeps that fluid electrically neutral.
4. Bicarbonate is the second most abundant anion in blood, so it ranks below chloride.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 26 "Fluid, Electrolyte, and Acid-Base Balance", section Chloride_
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