 plate lids also known as thrombocytes are approximately 1 to 2 micrometers blood corpuscles which lack nucleus. They are disk shaped and have a specialized membrane network formed by imagination of plasma membrane known as open canalicular system. So these dips in the membrane which you see these form open canalicular system. On the membrane there is a coating of glycoproteins giving the plate lids a negative charge on the membrane and because of this they repel away from the normal intact negatively charged endothelium. Also on the membrane there are various types of receptors. We will talk about few important ones. One is glycoprotein 1B receptor here GP means glycoprotein 1B receptor other is GP 2B 3A receptor. So this orange one we are showing as glycoprotein 2B 3A receptor. Also there is glycoprotein 6 receptor this glycoprotein 6 receptor. These glycoproteins interact with cytoskeletal elements of the cytoplasm. So here they are in contact with cytoskeletal proteins. Various proteins are there and this helps in stabilizing the shape of plate lids and also changing the shape of plate lids when needed. Now this change in shape we will see in another video on plate lids plug formation. Inside the cytoplasm there are two types of granules. Alpha granules which are the most abundant granules and the dense granules. Now alpha granules contain proteins which have a role in hemostasis. So some of these proteins are von Willebron factor, then fibrinogen. It is the same protein which forms fibrin we will see in coagulation. Then there is thrombin which is responsible for cleaving fibrinogen to fibrin. Then there are coagulation factors also most important is factor 5. The other granules that is the dense granules contain like ADP, ATP, then there is ionized calcium and serotonin. All these substances have a role in platelet aggregation and addition which again is a part of another video. So it is important to know the structure components of platelets to understand the function of platelets.