<span>Sodium channels close when not occupied
</span><span>Sodium ions diffuse through and enter the cell.
</span>
Then they leave the cell.
The sodium diverts in the cell layer have receptor locales for acetylcholine.
Answer:
negative feedback loop involving insulin and glucagon help to keep blood glucose levels within a narrow concentration range. If glucose levels get too high, the body releases insulin into the bloodstream.
hope it help
