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Nerves are what you feel things with. They go from
your brain all |
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through your body. Nerves make you react to things,
but how do |
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they do that? The nerves send signals to your brain
to tell your |
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brain when you are doing things. The nerves are one
of the most |
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important things in your body. You need nerves to
feel things. |
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Without them, you would never be able to feel your
dog's soft |
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fur, or feel water splash on your face. |
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The reception of nerves are helped with special
sensory cells. |
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Neurons are the conducting elements of the nervous
system. |
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They are capable of slow and general activity. They
can also |
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be rapid and highly efficient. A nerve impulse is a
specific |
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response for a neuron. Neurons are capable of
receiving |
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and sending information. |
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The Composition of
Nerves |
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Your nerve cells are made of a central portion called
the nucleus |
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and axons and dendrites. The nucleus is the cell
body. The |
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dendrites are short extensions of the cell body. They
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involved in the reception of stimuli. The axons are
usually |
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single long extensions. |
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The Nervous System
in Different Animals |
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In simple animals like jellyfish, the nerve cells
form a network. |
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This network is capable of mediating only a
stereotyped |
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response. Animals like shellfish, spiders, and
insects have |
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more complex nervous systems. |
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