CNS and receptors

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electrical impulses
used my the nervous system to enable you to react quickly to your surroundings and coordinate what you do
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receptors
these detect stimuli
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stimuli
changes in the environment
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receptor cells e.g light receptor cells are like what other cell?
animal cells, they have a nucleus cytoplasm and cell membrane
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neurons
impulses pass along these they are usually found in large quantitys known as nerves
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CNS
central nervous system, is made up of the brain and the spinal cord
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sensory neurons
these are cells which carry impulses from your sense organs to your CNS
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motor neurons
carry impulses to the right parts of your body
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effector organs
these respond to the impulses such as muscles contracting and glands secreting chemicals
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define reflex actions
automatic responses to stimuli
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relay neurons
connect a sensory and motor neuron in the CNS
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what is included in a reflex arc
sensory receptor, sensory neuron, relay neuron, motor neuron and effector organ
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define synapse
a gap between neurons where the transmission of information is chemical rather than electrical
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reflex actions
stimulus-->receptor-->coordinator-->effector-->response
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Card 2

Front

these detect stimuli

Back

receptors

Card 3

Front

changes in the environment

Back

Preview of the back of card 3

Card 4

Front

animal cells, they have a nucleus cytoplasm and cell membrane

Back

Preview of the back of card 4

Card 5

Front

impulses pass along these they are usually found in large quantitys known as nerves

Back

Preview of the back of card 5
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