Phospholipids in the platelet membrane are important for all of the following functions except:
a. Supply of arachidonic acid
b. Receptor for plasma fibrinogen
c. Receptor for plasma coagulation enzymes
d. Forms part of the platelet glycocalyx
ANS: B
Fibrinogen binds to the receptor GP IIb/IIIa. Membrane phospholipids supply arachidonic acid, which becomes converted to thromboxane during platelet activation. They form part of the platelet glycocalyx, which is the platelet surface. Many of the coagulation enzymes bind to platelet phospholipids, including factor IX, X, and prothrombin.
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