Pg. 16 of Guyton’s Medical Physiology states that
The carbohydrate moieties attached to the outer surface of the cell have several important functions:
- Many of them have a negative electrical charge, which gives most cells an overall negative surface charge that repels other negatively charged objects.
- The glycocalyx of some cells attaches to the glycocalyx of other cells, thus attaching cells to one another.
Why would cells that are negative charged attract according to the second point given above?