Identify one substance, other than the secretions from nerve cells, used in cell communication.

One substance, other than the secretions from nerve cells, that is used in cell communication are hormones.  

To add, a hormone is any member of a class of signaling molecules produced by glands in multicellular organisms that are transported by the circulatory system to target distant organs to regulate physiology and behaviour.

1) clean up you lab area2) dispose of the chemicals as instructed by your teacher3) put everything back where it belongs unless your teacher tells you otherwise4) dispose of gloves5) wash hands with soap and water