nerves+and+hormones

=__**Nerves and Hormones**__=

Key Points:

 * The human nerve system includes nerves, brain and spinal cord. It transfers information quickly around the body, as electrical impulses. Receptors recieve information about the body environment and effectors respond to it.
 * Many conditions inside the body are controlled by nerves and hormones. These include water and ion content, temperature and the sugar concentration in the blood.
 * Hormones control the menstural cycle in women.Hormones are also used to prevent pregnancy, to help an infertile couple to have a baby.
 * Plants produce hormones, such as auxin, which help them to respond to their enviroment.
 * Glands are organs that make and release useful substances.
 * All your muscles are effectors. An effector is an organ that does something in response to a stimulus.
 * A stimulus is a change in the enviroment

__**Central Nervous System**__

The central nervous system runs all the way from your brain, down the spinal cord and to everywhere in your body.

here are some useful websites:


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