JOHN BAVOSI / SCIENCE PHOTO LIBRARY JOHN BAVOSI / SCIENCE PHOTO LIBRARY
Arteriole blood cells. Illustration of blood cells emerging (at bottom) from an arteriole, a small branch of an artery. Various blood cell types are seen: red cells (erythrocytes) are carriers of oxygen; white cell monocytes or macrophages (blue) are, with neutrophils (pink, multi-lobed nucleus), cells that fight infection; much smaller platelets of different size and shape are responsible for blood clot formation. The arteriole wall is one cell thick, with semi-circular cells (red) suppor- ting and strengthening the wall. Fibroblast (yellow) cells are connective tissue secretory cells which help to support arterioles and nerve fibres (blue) within the vertebrate body.
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