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The paracrine system is a method of communication from one cell, to its neighbouring cell.  

This means, the signal is produced by one cell and induces changes in other nearby cells (short distances).

There are 3 types of hormonal transport systems:

Endocrine, Paracrine, Autocrine

The autocrine signalling is where the cell sends out a hormone which binds to the receptor of the same cell (causes change in the original cell).


Exocrine glands secrete their products directly into the external environment (venom, sweat and saliva), whereas endocrine glands secrete their products into the blood stream.  

The endocrine system relies on specialised glands releasing hormones into the blood stream, to pass the message onto other cells throughout the body.


Click here for more information on endocrine system

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Click here to learn more about pheromones

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