Hormones and Nerves

Hormones are chemical messengers sent in the blood. 

1) Hormones are chemicals produced in various glands (called endocrine glands). 

2) they are releaszed directly into the blood. The blood then carries them to other parts of the body. 

3) they travel all over the body but they only effect particular cells in particular places. 

4) the affected cells are called target cells - they have the right receptors to respond to that hormone. an organ that contains target cells is called a target organ.

5) Hormones travel at "the speed of blood". 

6) they have long lasting effects. 

Neurons Transmit Information Around The Body. 

Neurons (nerve cells) transmit information as electrical impulses…