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THE NERVOUS SYSTEM
·Sense organs
·Responses
·Reflex actions
·Synapses…read more

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SENSE ORGANS
Stimulus= a change in the environment
Sense organs ARE NOT the same as
receptors
SENSE ORGAN RECEPTOR/S IT CONTAINS
EYES Light
EARS Sound
NOSE Smell
TONGUE Taste
SKIN Touch, pressure, temperature
change…read more

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RESPONSES
The central nervous system (CNS)=brain
and spinal cord ONLY
Effectors are muscles and glands. They
response to `instructions' form the CNS
The effectors then
Stimulus detected by
carry out the
receptor
movement
SENSORY MOTOR NEURONS
NEURONES carry carry electrical
electrical impulse to impulses from the
the CNS CNS to the effectors…read more

Slide 5

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REFLEX ACTIONS
Reflex actions are automatic responses to
certain stimuli.
They reduce the chance of injury.
Reflex actions don't use the brain just the
spinal cord
Stimulus Sensory
Receptor
neurone
Relay
neurone
Motor
Response Effector
neurone
Block diagram of
a reflex arc…read more

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SYNAPSES
A synapse is where to neurones join.
The nerve signal is diffused (moved) by
chemicals across the gap.
This set the electrical impulse off in the
next neurone.
Diagram on next slide…read more

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Comments

s

so good has all the revision i need for my test thank you so much hopefully i will pass :D

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