2.85 reflex arc

http://www.bbc.co.uk/schools/gcsebitesize/science/aqa_pre_2011/human/thenervoussystemrev3.shtml

This is what happens:

1. receptor detects a stimulus - change in the environment
2. sensory neurone sends signal to relay neurone
3. motor neurone sends signal to effector
4. effector produces a response

2.84 understand that stimulation of receptors in the sense organs sends electrical impulses along nerves into and out of the central nervous system, resulting in rapid responses

understand that stimulation of receptors in the sense organs sends electrical impulses along nerves into and out of the central nervous system, resulting in rapid responses

2.83 CNS

2.82 nervous and hormonal communication

nervous system=electrical messages along nerves to and from different parts of your body

hormonal system=chemical messages around your body in the blood

2.77b thermoregulation/role of skin 2.88

2.77a thermoregulation

2.76 sensitivity