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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…

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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.

Sensory Neurones ­ Carry…

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