Receptors+and+Effectors

Natural Science Designed by Angela Ruiz Montero angela.ruiz.teacher@gmail.com ||
 * = **6. RECEPTORS AND EFFECTORS** ||
 * [[image:http://www.bbc.co.uk/schools/gcsebitesize/science/images/baby_hand.jpg width="180" height="198"]][[image:http://www.bbc.co.uk/schools/gcsebitesize/science/images/women_tongue.jpg width="180" height="198"]][[image:http://www.bbc.co.uk/schools/gcsebitesize/science/images/nose.jpg width="180" height="198"]][[image:http://www.bbc.co.uk/schools/gcsebitesize/science/images/women_eyes.jpg width="180" height="198"]][[image:http://www.bbc.co.uk/schools/gcsebitesize/science/images/man_ear.jpg width="180" height="198"]] ||
 * = 3rd Secondary Education
 * **1. Receptors and effectors** **Receptors** are groups of specialised cells. They can detect changes in the environment, which are called//stimuli//, and turn them into electrical impulses. Receptors are often located in the sense organs, such as the ear, eye and skin.

When a receptor is stimulated, it sends a signal along the nerve cells (called **neurones**) to the central nervous system. Usually, the brain - which is part of the nervous system - coordinates a response.

An **effector** is any part of the body that produces the response. Here are some examples of effectors:* a muscle contracting to move the arm* a muscle squeezing saliva from the salivary gland* a gland releasing a hormone into the blood. media type="custom" key="13591774" align="center"
 * Hormones** are chemical messengers produced in **glands** and carried by the blood to specific organs in the body.
 * In the next link you can learn more about receptors and effectors.
 * The following presentation will be really useful for studying:

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 * The following video will help you understand everything better:
 * **2. References**