Topic summary
Platelets
Extracted from the Wikipedia article Platelet.
Granule secretion
Platelets contain dense granules, lambda granules, and alpha granules. Activated platelets secrete the contents of these granules through their canalicular systems to the exterior. Bound and activated platelets degranulate to release platelet chemotactic agents to attract more platelets to the site of endothelial injury. Granule characteristics: