Nervous System B3

  • Created by: Aleena
  • Created on: 27-04-18 22:45
What does the CNS (central nervous system)do?
The CNS coordinates a response to a stimulus
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What is another name for nerve cells?
Neurones
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How does the CNS coordinate a response?
Stimulus detected by the receptors-info sent as nervous(electrical) impulses along sensory neurons to CNS-CNS coordinates response by sending info to an effector along motor neurone with a nervous impulse.The effector then responds accordingly
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Give some examples of effectors
Muscle contracts or gland secretes a hormone
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What is the Synapse?
a junction(gap) between 2 neurons
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Explain the importance of synapses in the Nervous System.
electrical impulse triggers release of neurotransmitter chemicals which diffuse across synapse.These chemicals bind onto receptor molecules in membrane of next neuron-triggering another electrical impulse-how info is passed between neurones
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Explain how the Reflex Arc works?
1)Stimulus detected by receptor 2)nervous impulse pass to CNS along sensory neuron to relay neuron-which passes the impulse to the effector along motor neuron .The effector then coordinates the response
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Why does the Reflex arc not involve the conscious part of the brain?
The relflex arc doesn't involve the conscious part of brain, so no time is wasting thinking about the right response-this makes reflexes automatic & rapid, limiting the amount of damage done to the body
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If you touch a flame what's the stimulus,receptor and response?
Stimulus:heat from the flame Receptor:Skin Response:The hand pulls away form the flame
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What stimuli does Skin(a sense organ) detect?
Changes in Pressure &Temperature as well as Pain
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What stimuli does tongue (a sense organ) detect?
Chemicals e.g. in food and drink
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What stimuli does Nose(a sense organ) detect?
Chemicals e.g.in the air
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What stimuli does Eye(a sense organ) detect?
light
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What stimuli does Ear(a sense organ) detect?
sound and position of head
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Other cards in this set

Card 2

Front

What is another name for nerve cells?

Back

Neurones

Card 3

Front

How does the CNS coordinate a response?

Back

Preview of the front of card 3

Card 4

Front

Give some examples of effectors

Back

Preview of the front of card 4

Card 5

Front

What is the Synapse?

Back

Preview of the front of card 5
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