What role does haptoglobin play in the context of hemoglobin and oxygen transport?

A It binds to free hemoglobin in the plasma, preventing its loss through the kidneys ✓
B It increases the production of erythropoietin in response to anemia
C It is involved in the transport of oxygen from the lungs to peripheral tissues
D It has no direct role in hemoglobin or oxygen transport

Explanation

Haptoglobin is a protein that binds free hemoglobin released from erythrocytes into the bloodstream, thus preventing its loss through the kidneys and conserving body iron.

Source

Robbins and Cotran Pathologic Basis of Disease
Hematology Hematology: Hemoglobin and Oxygen Transport Hematology: Hemoglobin and Oxygen Transport Easy MEDICAL Confidence: high