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Four major ways in which cells communicate with each other:

1. Diffusible signals, in which a cell releases a substance into the bloodstream, such as insulin, which then binds to a receptor on another cell to send instructions (insulin tells other cells to absorb sugar)

2. Electrical signals, in which cells communicate via miniscule eletrical currents

3. Tactile signals, in which cells or protein antennae get messages or instructions by touching other cells or the substances in the spaces between cells

4. Mechanical signals, in which cells respond to being bent or flexed; for example, when the antennae on cells in your ear bend, the cells send a signal that your brain interprets as sound

We have a lot of cells -> http://www.bioon.com/book/biology/mboc/mboc.cgi@code=220801800040279.htm