Nerve cells. Coloured scanning electron micrograph (SEM) of nerve cells, showing cell bodies (pink) and extensions called axons and dendrites (purple). Neurons are responsible for passing information around the central nervous system (CNS) and from the CNS to the rest of the body.
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.