via infinity-imagined: Neurons growing in a cell culture These time lapse animations use phase contrast microscopy to show neural stem cells in a nutrient medium for 4 hours. They reveal the dynamic growth and recycling of dendrites and synapses as neurons establish relationships with each other. The social behavior of these cells creates the incredible properties of the mind and brain. Credit: University of Victoria Medical Sciences
Schistosome fluke. Coloured SEM of a schistosome (Schistosoma sp.) fluke worm, a cause of schistosomiasis in humans. This parasitic trematode (flatworm) lives in the veins around the large intestine, anchoring itself to the wall of the blood vessel with several suckers (one seen at centre), and feeding on its host's blood. The worms cause fever and abdominal pain, and the eggs produced by the female worm can form obstructions of tissues known as granulomas.
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.