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Orange juice tastes sour because the tongue is sensing a high level of:

AHydrogen ions
BHelium atoms
CHafnium salts
DHormone traces
Answer & Solution
Correct answer: A. Hydrogen ions
1. Sourness tracks acidity. 2. Acidity means many hydrogen ions. 3. So it senses hydrogen ions. _Source: OpenStax Anatomy and Physiology 2e, Chapter 14, Special Senses._
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