What type of mechanism is blood sugar

Your question is interpretable but the mechanism for blood sugar regulation is called negative feedback.This means that when the blood sugar levels increase an enzyme called insuline comes into play and decreases the levels of blood sugar by glycogeneis(syntheis of glycogen) and increases the membrane permeability of cells for glucose. When glucose level decreases an enzyme called gucagon functions that has opposite effects.

this is a good question! i'll do some research and come back when i have the answer!