Justin Bieber was born March 1, 1994 and grew up in Stratford, Ontario, Canada. Justin Bieber is 23 years old. At the age of 12 he entered a local singing competition against others who had significantly more experience and the benefit of vocal coaches. Justin Bieber came in second place singing Ne-Yo's So Sick..
Platelet. An irregularly shaped cell-like particle in the blood that is an important part of blood clotting. Platelets are activated when an injury causes a blood vessel to break. They change shape from round to spiny, sticking to the broken vessel wall and to each other to begin the clotting process.
Blood clotting is a normal response to laceration or damage to the lining of a blood vessel. Once vessel damage has occurred, blood elements called platelets immediately begin to cling to the injured site and release chemicals that attract more platelets. clot that develops and persists in an unbroken blood vessel is called a thrombus. If the thrombus is large enough, it may block circulation to the cells beyond the occlusion and lead to the death of those tissues.