fill in the whole table both pathways number and effect of insuline Activity 4: BIOCHEMICAL PATHWAYS AND INSULIN Insulin is a protein hormone produced by the pancreas. It is a signal in the negative feedback pathway controlling blood glucose levels. Insulin secretion increases when blood glucose levels increase, and decreases when blood glucose levels decrease. As you would expect, insulin's primary "mission" is to decrease blood glucose. Cells respond to insulin by taking up glucose from blood and either using it energy or converting it to other forms. But, it also has a secondary mission, which is istructural forms (such as conversion of triglycerides). Model 1. Insulin and Hepatocytes Model 1 shows some of the biochemical reactions that occur in hepatocytes (liver cells). The thick arrows indicate the movement of a substance in or out of the cell. The thin arrows represent chemical reactions. We have substituted numbers (e.g. 1, 2,3) for enzymes that are regulated by insulin. In some cases, a number represents multiple enzymes accomplishing multiple steps. Do not fill in the table yet..