The bluish color of mucous membranes, nail beds, and skin that occurs when blood is not picking up an adequate amount of oxygen from the lungs is known as:

• A. Erythema
• B. Cyanotic
• C. Jaundice
• D. Pallor

Answer: (B)

Cyanosis is the bluish discoloration seen when blood is more deoxygenated because the lungs aren’t delivering enough oxygen. The color change is most noticeable in thin, well-vascularized areas like mucous membranes and nail beds, where low oxygen levels make deoxyhemoglobin dark and give a blue tint. This distinguishes it from the other options: erythema is redness from increased blood flow or inflammation, jaundice is yellow from bilirubin, and pallor is pale from reduced blood flow or anemia. In short, the description fits cyanosis, a sign of inadequate oxygenation.