Scanning electron micrograph (colour enhanced) of an atherosclerotic plaque This cross section through an artery shows how an atherosclerotic plaque has narrowed the lumen of the vessel.
	Severely atherosclerotic artery In this in-body photograph the fatty atherosclerotic deposits lining the walls of the artery are clearly visible.
	In-body view of the aorta This photograph has been taken inside the body's major artery, the aorta. Arteries branch to carry oxygenated blood to the organs and limbs.
	Scanning electron micrograph (colour enhanced) of a bone-degrading osteoclast Bone is a living tissue that is constantly being broken down and rebuilt. This image shows an osteoclast, a type of cell responsible for degrading bone. The space surrounding the cell is known as a resorption cavity.
	Scanning electron micrograph (colour enhanced) of bone-building osteoblasts Osteoblasts are the cells that rebuild bone. The turnover of bone enables the skeleton to adapt to the demands placed on it.
	Positron Emission Tomography (PET) scans of the brains of a person suffering from depression (left) and a person without depression (right) Many sufferers of depression have been found to have an increased metabolic activity and hence blood flow in certain areas of the brain. The red and yellow colours represent increased blood flow compared to the blues and greens in the healthy state.
	Cells from the nervous system (light microscopy) These neurones have been filmed through a light microscope. The threadlike projections called dendrites enable neighbouring cells to communicate.
	Scanning electron micrograph (colour enhanced) of a blood clot The fibrin threads that form the scaffold of the blood clot can be clearly seen (brown). Red blood cells are trapped in the fibrin network.
	White blood cells (colour-enhanced scanning electron micrograph) The cells of the immune system play pivotal roles in the inflammatory response. In this image we can see a macrophage (brown) and two T-lymphocytes (blue).
	Neurones (light microscopy) Cells in the nervous system communicate with each other via a complex network of threadlike projections.
	Scanning electron micrograph (colour enhanced) of a bleeding gastric ulcer Red blood cells and fibrin threads indicating clot formation at the site of a gastric ulcer.
	Scanning electron micrograph (colour enhanced) of Helicobacter pylori H. pylori (yellow) is the bacterium that causes stomach ulcers. This image shows how the bacteria adher to the surfaces of epithelial cells from the lining of the stomach.
	Scanning electron micrograph of a tooth The ridged appearance is the result of a dental procedure.