the endocrine system uses           messages called          to send signals which are fast or slow.
asked May 2, 2012 by anonymous

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I am not sure exactly what the question is asking but the endocrine system sends hormones which can also be referred to as ligands through the blood stream to  binding sites called receptors which are found embedded in the cell membrane of the target cells.
answered May 2, 2012 by anonymous

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