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23.2 MB (2.4 MB compressed)
2352 x 3442 pixels
19.8 x 29.2 cm ⏐ 7.8 x 11.5 in (300dpi)
PROFESSORS P. MOTTA & T. NAGURO / SCIENCE PHOTO LIBRARY PROFESSORS P. MOTTA & T. NAGURO / SCIENCE PHOTO LIBRARY
Liver cell. Coloured high resolution scanning electron micrograph of a liver cell (hepatocyte). At centre is the nucleus with its chromatin fibres (spongy). The chromatin contains the chromosomes which hold the genetic instructions. Mitochondria (red saw-toothed) are the sites of energy production. The high number here indicates a metabolically active cell. The stacked membranes (yellow) are endoplasmic reticulum (ER). On some ER ribosomes give the membranes a granular appearance. This "rough" ER is involved in protein synthesis. ER (without ribosomes) is involved in fat metabolism. Magnification unknown.
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