$P_{50} \approx 26 \text{ mmHg}$ under normal physiological conditions.
Back to NEET UG 2026 Human Physiology
NEET UG 2026 — Biology Human Physiology
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mcq
2026
Official previous-year question
Verified 30 May 2026.
Question
The oxygen dissociation curve of haemoglobin is sigmoid. At what partial pressure of $\text{O}_2$ is haemoglobin approximately $50\%$ saturated ($P_{50}$)?
Options
- A
$26 \text{ mmHg}$
- B
$40 \text{ mmHg}$
- C
$60 \text{ mmHg}$
- D
$100 \text{ mmHg}$
Solution
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