50.9 MB (1.5 MB compressed)
4922 x 3617 pixels
41.7 x 30.7 cm ⏐ 16.4 x 12.1 in (300dpi)
DR. GOPAL MURTI / SCIENCE PHOTO LIBRARY DR. GOPAL MURTI / SCIENCE PHOTO LIBRARY
Cilium. Transmission Electron Micrograph (TEM) of a cross-section through a single cilium from a protozoan. Cilia are thread-like structures attached to the surface of some cells. They can make cells motile. They also help to keep air passages in the lungs clean. Each cilium contains two central microtubules (black circles) surrounded by nine pairs of microtubules arranged like a "wheel". This is known as the 9+2 arrangement. Pairs of parallel microtubules slide over each other causing the cilia to move in a beating motion. Magnification: x70,000 at 35mm size.
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