| A | B |
|---|
| CNS | = brain and spinal cord |
| The nervous system | enables communication |
| communication in the nervous system | relies on electrical signals |
| electrical signals are | are called impulses |
| nerve cells | neurones |
| nerves | bundles of neurones |
| vertebrae | protect the spinal cord |
| stimulus | a change in the body or the environment |
| eyes, ears, skin | sense organs |
| sight, hearing, touch | senses |
| receptor cells | detect stimuli |
| receptor cells are found | in sense organs |
| temperature change is detected by | receptors in skin |
| receptor cells | create impulses |
| the brain is essentially | a processor |
| a stimulus will result | in a response |
| neurotransmission | the travelling of impulses |
| sensory neurones | carry impulses from receptor cells to the CNS |
| dendrites | tiny branches which receive impulses from receptor cells |
| dendron | area of a SN between the dendrites and cell body |
| axon | the main stretch of a neurone |
| axon terminals | allow impulses to be transmitted to other neurones |
| dendrons and axons | are long |
| myelin sheath | fatty insulation around the axon |
