STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Retinal rod cell. Transmission electron micrograph (TEM) of a section through a rod cell from the retina of an eye, showing the inner segment (bottom) filled with mitochondria (green), and outer segment made up of stacks of folded membranes (orange). These folds contain the photo pigment rhodopsin. The retina is a thin tissue layer on the inner eye responsible for sight. Rod cells are long photoreceptor nerve cells that respond to dim light. They compliment cone cells (not shown) that detect colour. Magnification: x18,000 when printed 10 centimetres wide.
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