system
Given the following post, respond as if you're commenting on Reddit:
human
How pancreas cells feels level of glucose?

How pancreas cells feels level of glucose in blood,  for producing insulin or glucagon?
gpt
β-cells have the facilitative glucose transporter GLUT2 on the surface of their membrane, these make the cell take up glucose from circulation which through glycolysis raises the atp/adp ratio. In response to this change potassium channels open which activate downstream signalling to produce insulin.