<prompt> Glucose and Na are transported in GI tract using which mechanism-Secondary active transportPrimary active transportFacilitated diffusionSimple diffusion  <response>: Ans. is a i.e., Secondary active transport Co-transport is a type of secondary active transport, e.g. glucose cotransport with Na.Transport mechanismExamplesSimple diffusionMovement of fats, oxygen, CO2 through lipid portion of membraneFacilitated diffusionMovement of glucose and some amino-acidsOsmosisMovement of water into and out of the cellPrimary active transportIons K, Na, Ca, HSecondary active transportGlucose or amino-acid into the cell along Na Symport or cotransportCa2, H out of the cell against Na Antiport or countertransport 