When the blood glucos levels i too low, it gets picked up by cells in the pancreus. And then that does the same thing, jumps into the blood stream. So again, you've still got all the components of the a homosthatic mechanism present. But what we've only spoken about thus far matthew, is negative feedback,. where the effect negates, or does the opposite of the stimulus. Goes too high, brings it day, and goes to low, brings it up. There is also sent the cood, positive feedback, which is not as common as negative feedback but it uses the exact same mechanisms.