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B1.2 - nerves and hormones (The nervous system (Neurones (Neurones are…
B1.2 - nerves and hormones
The nervous system
The nervous system allows the body to react to different changes in the environment
Receptors
sensitive to
Eyes
Light
Ears
Sound and position of head
Tongue
Chemicals in food
Nose
Chemicals in the air
Skin
Pressure, temperature, pain and touch
Cells
Most animal cells have a nucleus, cytoplasm and cell membrane
Neurones
Neurones are nerve cells that carry information as electrical impulses
There are 3 types of neurones that do 3 different jobs
sensory neurones
carry signals from receptors to the spinal cord and brain
relay neurones
carry messages from one part of the CNS to another
motor neurones
carry signals from the CNS to effectors.
Synapses
Where two neurones meet there is a tiny gap called a
synapse
The impulses cross this gap by using chemical impulses
One side lets out the chemicals then the other absorbs it and the impulse carries on