Alpha granules

A type pf platelet granule.There are three types of granules present within platelets: Alpha granules, Delta (dense) granules and Lysosomes. Alpha granules contain the larger molecules such as Platelet Factor 4 (PF4), Platelet-derived growth factor (PDGF), fibrinogen and some other clotting factors. The Delta (Dense) Granules contain the smaller molecules such as Serotonin, ADP, & Calcium. Mnemonic is Alpha stands for the "Bigger" molecules such as proteins and peptides, while Delta or Dense stands for "Diminutive" (tiny) molecules.