CARBOHYDRATE METABOLISM

The endproducts of carbohydrate digestion absorbed into the blood and taken to  the liver by  hepatic portal vein  are four  monosaccharide sugar  ( C₆H₁₂O₆) viz, glucose, fructose mannose and   galactose. Liver cells   readily  convert  fructose , mannose and   galactose  into D glucose .Hence, mainly  Dglucose  circulates in the blood. Normal glucose  concentration  inhuman  blood is  100  milligrams per100 millilitres  of  blood i.e. about 0.1%  of blood . After  meals  blood  sugar  level  may rise  upto 0.14%  depending  upon the amount  of  carbohydrates  digested from  food. During  fasting 8 to10 hours  after  meal , glucose  level  in blood  falls  to about   60to 70 mg 100 mi  of  blood. Glucose is  transported  into  the cells  across  the plasma  membrane  by facilitated  diffusion  through  carrier  proteins.

The cellular metabolism  of carbohydrates  in the  body  is divisible  into  five main  aspects  glycogen  glycogenolysis , anabolism and lipogenesis,  gluconeogenesis  amd catabolic breakdown.