What is the primary function of von Willebrand factor in the context of blood components?

A To facilitate platelet adhesion to damaged endothelium ✓
B To regulate blood pressure through vasoconstriction
C To transport oxygen to tissues
D To stimulate erythropoiesis

Explanation

Von Willebrand factor plays a crucial role in primary hemostasis by facilitating platelet adhesion to damaged endothelium, thereby initiating the formation of a platelet plug.

Source

Guyton and Hall Textbook of Medical Physiology
Hematology Hematology: Blood Components Hematology: Blood Components Medium MEDICAL Confidence: high