The Nervous System
- Created by: isabella newsum
- Created on: 15-11-14 16:51
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- The Nervous System
- Five Sense Organs
- Eyes
- Light receptors- sensitive to light
- Ears
- Sound receptors- sensitive to sound, also balance receptors- change in postition
- Nose
- Smell receptors- sensitive to chemical stimuli
- Tongue
- Taste receptors- chemical stimuli
- Skin
- Sensitive to touch, pressure, pain and temp change
- Eyes
- A Stimulus
- Change in your Environment
- Light, sound, touch, pressure, pain, chemical, change in position/temp.
- Change in your Environment
- Neurones
- Sensory Neurone- nerve cells, carry electrical impulses via receptors to the CNS
- Relay Neurone- nerve cells, carry signals from Sensory Neurone to Motor Neurone
- Motor Neurone- nerve cells, carry signals from CNS to to the Effector (muscles or glands)
- Effectors- muscles contract and glands secrete hormones
- CNS
- Brain and Spinal Chord
- Neurones transmit information to the CNS
- 'Instructions' from CNS are sent to the effectors
- Synapse
- Connection between two Neurones
- Nerve signal transferred by chemicals, which diffuse across the gap
- Reflexes
- Automatic Responses
- Passage of info in a reflex (receptor to the effector) is called a reflex arc
- Reflex Arc
- Go through the spinal chord or the unconscious part of the brain
- Five Sense Organs
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