<prompt> Platelet Dense granules contain all except -ADP5-HTCalciumVWF  <response>: Platelets contain two specific types of granules : -A Alpha granule Contains fibrinogen, fibronectin, factors V VIII, PDGF, TGF- β and platelet factor 4.B Dense bodies or δ granules Contain ADP, Ca2, histamine, serotonin, and epinephrine. 