Biology, 13.07.2019 19:40 Russthaofficial
Anumber of systems for pumping ions across membranes are powered by atp. such atp-powered pumps are often called atpases, although they do not often hydrolyze atp unless they are simultaneously transporting ions. because small increases in calcium ions in the cytosol can trigger a number of different intracellular reactions, cells keep the cytosolic calcium concentration quite low under normal conditions, using atp-powered calcium pumps. for example, muscle cells transport calcium from the cytosol into the membranous system called the sarcoplasmic reticulum (sr). if a resting muscle cell's cytosol has a free calcium ion concentration of 10-7 while the concentration in the sr is 10-2, then how is the atpase acting?
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Anumber of systems for pumping ions across membranes are powered by atp. such atp-powered pumps are...
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