Oxygen-Hemoglobin Dissociation Curve Points Steps:

• Identify lungs as high pO2 environment (~100 mmHg), yielding ~97-100% hemoglobin saturation on the curve.
• Locate liver as metabolically active tissue with lower pO2 (~20-40 mmHg), causing ~40-75% saturation due to Bohr shift.
• Match high-saturation point L to lungs (steep curve top).
• Match mid-low saturation point K to liver (curve plateau descent).

Why B is correct:

• Option B pairs L (lungs: high pO2, full saturation) with K (liver: low pO2, partial unloading), aligning with the oxygen-hemoglobin dissociation curve's sigmoidal shape and tissue-specific unloading.

Why the others are wrong:

• A: J too low for lungs (under-saturation at low pO2).
• C: M mismatches lungs (overestimates tissue unloading); J too low overall.
• D: M incorrect for liver (high saturation not tissue-appropriate); K alone fits but paired wrong.

Final answer: B