<span>A Cell Address describes the location of a cell based on its column and row location. A combination of the letter and a number that specifies the column and the row in which a cell is located on a spreadsheet.</span>
<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.
Arrow a should point to muscle tissue, arrow B should point to an organ, arrow c should point to organ system.
Answer: Precipitation I believe
