Platelet structure.

Platelets have multiple surface receptors, a cannalicular system, microtubules, mitochondria, three types of granules (lysosomal, alpha, and dense), and deposits of small factors like glycogen (Figure 2 and 3) [54]. Whereas dense granules contain factors that potentiate platelet activation, α-granules contain growth factors and clotting proteins that contribute to hemostasis [130].