Nervous control in Humans

BBC Bitesize has an article about sense organs and nerve control.

You should make sure you understand the words

stimulus; receptor; sensory neurone; central nervous system; synapse; transmitter; relay neurone; motor neurone; effector; response

Make sure you look at the second page of the BBC article and look for the difference between rods and cones in the eye

Tom found this link to a web site that explains how neurones talk to each other. Thanks Tom


See the BBC bitesize article about this

Tropic responses

Try this article about tropisms


The BBC article on homeostasis gives a lot of information, but not all of it is needed for this unit - see the syllabus to find out which is needed.


This is a good article from the BBC Bitesize website about this topic.

These are words you should know:

medicinal drug use, recreational drug use, addictive, withdrawal symptom, hallucinogen, stimulant, depressant, performance enhancer, painkiller

Smoking and passive smoking