When the blood in the villi(finger like projections in the small intestines) is rich in simple sugars.The blood capillaries unite to form larger blood vessels,which in turn unite to form a large vein,the hepatic portal vein.This vein transports the sugar to the liver.
When there is an exessive amount of glucose in the liver pancrease secretes more insulin(which will enter the liver) to store glucose by converting it to glycogen.The blood glucose level falls.
When there is too little amount of glucose in the blood,pancrease produces more glycerol to convert the stored glucose(glycogen) to glucose in the liver.The blood glucose level rises.
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