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In the human body, most biochemical substances, such as proteins and enzymes, function optimally at a neutral pH of around 7.4, which is crucial for maintaining homeostasis. However, the stomach contains gastric acid, primarily hydrochloric acid (HCl), which has a low pH of around 1.5 to 3.5, necessary for digestion and killing pathogens. Additionally, the blood bicarbonate system helps regulate pH, ensuring that most bodily functions occur within a narrow pH range despite the acidic environment of the stomach.

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3w ago

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