<prompt> Glucose diffusion in RBC by -GLUT 1GLUT 2GLUT 3GLUT 4  <response>: Ans. is a i.e., GLUT 1 o GLUT 1 is present in placenta, BBB, RBC, kidney and colon. FunctionMajor sites of expressionSecond ary active transportNa-glucose cotransport o SGLT 1o SGLT 2Absorption of glucoseAbsorption of glucoseSmall intestine, renal tubulesRenal tubulesFacilitated diffusiono GLUT 1Basal glucose uptakePlacenta, Blood-brain barrier, brain, RBC,Kidney, colono GLUT 2B-cell glucose sensor.Transport out of intestinal and renal epithelial cellsB cells of islets, liver, epithelial cells of small intestine Kidney-o GLUT 3Basal glucose uptakeBrain, Placenta. Kidneyo GLUT4Insulin-stimulating glucose uptakeSkeletal and cardiac muscle.Adipose tissueo GLUT 5Fructose transportjejunum, spermo GLUT 6NonePseudogeneo GLUT 7G-6-P transporter in ERLiver 