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FRANCIS LEROY & OLIVIER WAUTIER, BIOCOSMOS / SCIENCE PHOTO LIBRARY FRANCIS LEROY & OLIVIER WAUTIER, BIOCOSMOS / SCIENCE PHOTO LIBRARY
Glucose co-transport, animation. The process of co-transport allows glucose molecules to move into the cell from an area of low concentration to one of high concentration. The membrane protein to the left binds both a glucose molecule (green) and a sodium ion (pink). The transport of the glucose molecules up their concentration gradient is driven by the transport of sodium ions from a high to low concentration. To the right of this transmembrane protein is a sodium/potassium pump. This is powered by ATP and works to maintain the low concentration of sodium ions on the inside of the cell. Sodium ions (pink) are pumped out of the cell, whilst potassium ions (blue) are pumped in.
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