How do you get blood clots?

Plasmin

Platelets or blood clotting proteins cause blood to clot.

The blood coagulation which you are referring to has several stages and types. The main cells involved directly are thrombocytes, while endothelial cells etc may also play a role.There are also...

Straining to do something like working out or stayin in the same position while ur sleep. also clotting more than the size of a quarter cn be a misscariage

There are the intrinsic and extrinsic pathways in clotting. The intrinsic pathway is initiated when blood comes in contact with damaged endothelium or collagen, and involves clotting factors XII, XI,...