Dense bodies contain
A. FibrinogenB. PF 4
C. PDGF
D. TGF beta
E. Ionized calcium
The answer is. E. Ionized calcium
Platelets are
disc-shaped; anucleate cell fragments that areshed from megakaryocytes in the
bone marrow into the bloodstream. They play a critical role in normal
hemostasis, byforming the hemostatic plug that initially seals vasculardefects,
and by providing a surface that recruits andconcentrates activated coagulation
factors. Their functiondepends on several glycoprotein receptors, a
contractilecytoskeleton, and two types of cytoplasmic granules.α-Granules have
the adhesion molecule P-selectin on theirmembranes and contain fibrinogen,
fibronectin, factors V andVIII, platelet factor 4 (a heparin-binding
chemokine), plateletderivedgrowth factor (PDGF), and transforming growth
factor-β (TGF-β). Dense (or δ) granules contain ADP and ATP, ionizedcalcium,
histamine, serotonin, and epinephrine.
