Talk about platelets.

Anucleated fragments surrounded by a plasma membrane, oftenly grouped into clusters diameter varies between 2-4 microm, shape varies according to degree of activity. Cytoplasm contains inactive peripheral hyalomere and basophilic central granulomere. Granulomere contains lysosomes and peroxisomes; while hyalomere contains a cytoskeleton of contractile proteins (actin, mysoin, thrombosthenin) microtubules and enzymatic system for aerobic and anaerobic metabolism cytoplasm also contains glycogen and mitochondria, play a role in hemostasis (blood clotting) lifespan is about 8-12 days spleen is reserve.