Symport is one of the types of secondary active transport, in which substance A moves across the membrane against a chemical or concentration gradient, and simultaneously with substance A, substance B movesacross the membrane in the opposite direction - in the direction of its chemical or electrical gradient. During symport, both substances are moved across the cell membrane in the same direction. An example of this is the absorption of glucose in the small intestine, when glucose is transported from the lumen of the intestine to the enterocyte against the concentration gradient and at the same time sodium is resorbed into the enterocyte along the concentration gradient. The gradient for sodium is created by the Na+-K+-ATPase in another part of the membrane.
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Source[edit | edit source]
ŠVÍGLEROVÁ, Jitka. Symport [online]. [cit. 12.11.2010]. <https://web.archive.org/web/20160306065550/http://wiki.lfp-studium.cz/index.php/Symport>.