<prompt> A baby boy is brought to the hospital because of convulsion. In the course of work up his body temperature plasma glucose are normal but his CSF glucose is 12 mg dl. A possible explanation isSGLT 1 deficiency in astrocytesGLUT 5 deficiency in cerebral capillariesGLUT-1 55 K deficiency in capillariesGLUT-1 45 K deficiency in microglia  <response>: Ans: c GLUT 1 55K deficiency in capillaries Ref: Ganong, 22nd ed, p. 615It is a direct pick from self study MCQs in Ganong.According to the given parameters there is deficient transport of glucose across brain capillaries.The predominant GLUT in the brain is GLUT-1 55 K Ganong p. 615. GLUT-1 45 K is also present in brain capillaries and not in microglia.GLUT 1 - RBC, brain, kidney, placenta, retinaGLUT 2 - Liver, B cells of pancreasGLUT 3 - BrainGLUT 4 - Skin, cardiac muscle, adipose tissueGLUT 5 - Testes, spermsGLUT 7 - Liver, endoplasmic reticulumNote:GLUT 4 is mediated by insulin.GLUT 5 is used as a fructose transporter semen. 