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Nervous system review

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    biology nervous system
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  • What does the CNS stand for and what makes it up?
    Central nervous system is made up of the brain and spinal cord
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  • What does a sensory neuron do?
    transmits nerve impulses away from receptor cells when a stimulus is detected
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  • What does a relay neuron do?
    connects one neuron to the next
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  • How do sensory and relay neurons differ in structure?
    Sensory neurons are longer as they have to transmit messages from distant parts of the body to the CNS; relay neurons have a short axon
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  • What do motor neurons do?
    transfer nerve impulses from the brain or the spinal cord to effectors, such as muscles or glands
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  • What is the name of the part of the neuron shown on the left? How do you know?
    cell body because it contains nucleus
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  • What is the function of the myelin sheath?
    it makes the nerve impulses travel faster
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  • What is the function of the dendrons and dentrites?
    receive input from other neurons and transmit to the axon
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  • What is a synapse
    the gap or junction between two adjacent neurons
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  • Name the three types of nerve cells.
    Sensory, relay, motor
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  • What is the name for the place on the neuron where a signal is transmitted to the next neuron
    axon terminal
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  • What is an example of a reflex action?
    pulling hand away from hot object; ducking when something moves toward your head; knee-jerk (patellar reflex)
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  • Describe the pathway for a reflex arc
    receptor → sensory neurone → relay neurone → motor neurone → effector
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  • Name two examples of receptors
    ouch receptors in the skin sound receptors in the ear light receptors in the eye, chemical (taste) receptors in the nose, tongue and mouth t
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