Responding to the Environment - The Nervous System

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Responding to the Environment
Voluntary responses have a conscious control:
Reaction:
Stimulus
Receptor
Sensory Neurone
Sends message to the CNS
CNS processes information
Decision
Sends message to body
Motor neurone
Effector (muscle)
Response
Involuntary responses have a subconscious control
Reaction:
Stimulus
Receptor
Sensory Neurone
Sends message to CNS
Decision
Motor Neurone
Effector
Response
These responses are needed for survival
They happen through responses under direction of the Central Nervous System and
Peripheral nerves

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Neurones
The nervous system is made up of the brain and the spinal cord which are the CNS and the
peripheral nervous system. Impulses are electrical and are carried in cells called neurones.
There are 3 different types of neurones. They carry information as electrical signals.…read more

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