<prompt> All of the following are examples of primary active transpo, except:The NaK ATPase in the red cell membraneThe HK ATPase in the parietal cell of stomachNa glucose sympoerSERCA in the skeletal muscle  <response>: Sodiumglucose sympoer is an example of secondary active transpo. SERCA: Sarcoplasmic Endoplasmic Reticulum Ca ATPase. It transpos two molecules of Ca for each molecule of ATP hydrolysed. Ca pumped out of the sarcoplasm, into the longitudinal tubules, to decrease the sarcoplasmic and thus causes muscle relaxation. 