resin cast of blood vessels | Arteries of a stillborn human baby's head, neck, and brain, colored resin cast. The blood vessels are very dense around the thyroid gland, and the outline of the tongue can also be seen.
Blood clot. Coloured scanning electron micrograph (SEM) of a blood clot from the inner wall of the left ventricle of a human heart. Red blood cells (erythrocytes) are trapped within a fibrin protein mesh (cream). The fibrin mesh is formed in response to chemicals secreted by platelets (pink), fragments of white blood cells. Clots are formed in response to cardiovascular disease or injuries to blood vessels. Connective tissue (orange) is also seen.