Hydroxyl group of serin act as a side chain enzyme. Glucose 1- phosphate is converted to glucose 6- phosphate by the enzyme phosphoglucomutase.
Those tissues also house the enzyme glucose 6- phosphatase, which converted to glucose 6- phosphate into free glucose that is secreted into the blood , thereby restoring blood glucose levels to normal. It is intracelluar form of blood glucose.
Phosphorylation traps the glucose by placing a negative charge on the molecule , preventing its diffusion back across the cell membrane into the blood. Hexokinase enzyme acts on glucose and converts to glucose 6-phosphate.
Endocytosis is a cellular process in which substances are brought into the cell. The material to be internalized is surrounded by an area of cell membrane, which then buds off inside the cell to form a vesicle containing the ingested material.
