blood disorders
Components of Blood
Platelets
Platelets (also called thrombocytes) are cell-like particles that are smaller than red or white blood cells. Platelets are fewer in number than red blood cells, with a ratio of about 1 platelet to every 20 red blood cells. Platelets help in the clotting process by gathering at a bleeding site and clumping together to form a plug that helps seal the blood vessel. At the same time, they release substances that help promote further clotting. When the number of platelets is too low ( Overview of Thrombocytopenia ), bruising and abnormal bleeding become more likely. When the number of platelets is too high ( Essential Thrombocythemia ), blood may clot excessively and can block blood vessels causing disorders such as a 