Question:
pH of Jejunum
pH of Jejunum
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Remember, the pH gradually increases from acidic in the stomach (around 1–3) to neutral or slightly alkaline in the small intestine (around 6–7.5), which helps enzymatic digestion and absorption.
Updated On: Jul 14, 2026
- 6.8±4
- 1±4
- 3±8
- 5±1
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The Correct Option is A
Approach Solution - 1
The jejunum is part of the small intestine where the pH is slightly alkaline to neutral, generally around 6.8 to 7.4. This mildly alkaline environment aids in the function of intestinal enzymes and nutrient absorption.
The options given show various pH values, but the value closest to the physiological pH of the jejunum is (a) 6.8±4, representing the expected pH range.
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Approach Solution -2
This question asks for the approximate pH of the jejunum, the middle part of the small intestine. Compare the physiological pH range of the jejunum against the value in each option.
- 6.8±4: The jejunum sits just past the duodenum, where pancreatic and biliary secretions have already neutralized the acidic chyme coming from the stomach. Its luminal pH runs mildly acidic to neutral, centered close to 6.8, which matches this option, making it correct.
- 1±4: A pH near 1 describes the strongly acidic environment of the stomach, where gastric acid keeps the lumen highly acidic for digestion and to kill ingested microbes. This value is far too low for the jejunum, which has already been neutralized by the time chyme reaches it, so this option is incorrect.
- 3±8: A pH around 3 is still in the strongly acidic range typical of the stomach or the very start of the duodenum before full neutralization occurs, not the more neutral jejunum further down the small intestine, so this option is incorrect.
- 5±1: A pH of 5 is more consistent with segments where partial neutralization is still underway, such as the proximal duodenum, rather than the jejunum, where the pH has settled closer to neutral, so this option is incorrect.
The value that matches the mildly acidic to neutral environment of the jejunum is close to 6.8.
Therefore, the correct answer is 6.8±4.
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