In cells, a common example is the found in the intestines and kidneys.
While secondary active transport does not directly use ATP to transport molecules, it indirectly relies on ATP to establish the concentration gradient of the driving molecule. In the case of the sodium-glucose cotransporter, the concentration gradient of sodium ions is maintained by the sodium-potassium pump, which uses ATP to pump sodium ions out of the cell. does secondary active transport use atp
Enterocytes (intestinal cells) absorb glucose from the gut lumen using the SGLT1 symporter (Secondary Active Transport). The lumen may have very low glucose, but the cell accumulates it using the Na+ gradient. In cells, a common example is the found
Secondary active transport relies on potential energy stored in an electrochemical gradient. In most animal cells, this is a sodium gradient. The cell maintains a low intracellular concentration of Sodium (Na+) and a high concentration of Potassium (K+). Consequently, Na+ "wants" to rush into the cell. Enterocytes (intestinal cells) absorb glucose from the gut
To illustrate the importance of this indirect ATP usage, we look at two critical physiological systems.