P50 of human haemoglobin ≈ 26 mmHg.
NEET UG 2026 — Biology Human Physiology
The oxygen dissociation curve of haemoglobin is sigmoid. At what partial pressure of O₂ is haemoglobin approximately 50% saturated?
Verified 30 May 2026.
26 mmHg
40 mmHg
60 mmHg
100 mmHg
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