2.82 - nervous and hormonal communication

- the nervous system includes the brain, spinal cord, peripheral nerves and sense organs such as the eye and ear
- messages are passed by electrical impulses
- the endocrine system uses chemical communication by hormones which are excreted by endocrine glands and cells
- this system helps maintain body functions like metabolism and growth
- this has more long-term effects than the nervous system and its response is less rapid