4.1.2 NERVES

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What does the nervous system consist of?
neurons and glial (supporting cells)
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What are sensory receptors?
transducers - convert different forms of energy into nerve impulses
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Give some examples of sensory receptors
light sensitive cells in the retina// olfactory cells in the retina detect presence of volatile chemicals// tastebuds detect presence of soluble chems/ pressure receptors
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What do sensory neurons do?
transmit impulses from receptors to the CNS
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What does the Central nervous system consist of?
brain and spinal cord
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Describe the structure of sensory neurones
a dendron carrying nerve impulse from receptor to cell body - axon carries impulse from cell body to CNS
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What do motor neurones do?
transmit impulses from the CNS to effectors, such as muscles and glands
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Describe the structure of motor neurones
a cell body at end with a large nucleus with lots of rough ER and golgi / many short dendrites that carry impulses to body/ long axon that carries impulse
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Why do motor neurones have such large nuclei?
lots of Rough ER and golgi to synthesise proteins involved in impulse transmission
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Card 2

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What are sensory receptors?

Back

transducers - convert different forms of energy into nerve impulses

Card 3

Front

Give some examples of sensory receptors

Back

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Card 4

Front

What do sensory neurons do?

Back

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Card 5

Front

What does the Central nervous system consist of?

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