Circulatory System

Platelets are flattened discs that are round from above and spindle shaped section. Megakaryocytes are very active cells that continually make proteins, enzymes, and membranes. But instead of getting bigger. They just shed small membrane-enclosed packets of cytoplasm into circulation. This is where platelets come from. Platelets were once thought to had lost their nucleus so histologists called them thrombocytes. They are constantly getting replaced. A platelet circulates for about 10 - 12 days and are removed …

…other blood group in the ABO system ] aneurysm - a small area that is a pathological, blood-filled dilatation of a blood vessel caused by a disease or weakening of the vessel's wall ] sphygmomanometer - an instrument for measuring blood pressure in the arteries, they usually have a pressure gauge and a rubber cuff that wraps around the upper arm and inflates to constrict the arteries ] anticoagulant - a substance that prevents the clotting of blood