Download Nerve cord

Receiving information from the environment to
coordinate a response
Pg. 180-185
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Allows animals to detect and process signals to react to
them
 Stimulus: a signal that causes an animal to react
Example: touch, sound, smells, tastes
 Response: an animal’s reaction to a stimulus
Types of Cells…
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Neuron: nerve cell with a unique
structure for receiving and passing on
information.
Sensory Neuron: nerve cells that detect
stimuli
Interneurons: nerve cells that pass
information between neurons
Motor neurons: nerve cells that carry
response information to muscles and
other organs
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“Nerve net”: Simplest nervous system are a netlike
arrangement of neurons throughout the body
“Nerve cord”: Most complex have a nerve cord and a
brain
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Brain: organized grouping of neurons in the head of an
animal
 Receives info, interprets it and control’s an animal’s
response
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Sense Organs
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Eyes, ears, nose
detect stimuli in
the form of
sound, light,
odor, and touch
Mostly found in
the head
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A frog detects vibrations with its
tympanic membrane
Platypus uses its bill to detect the
movements of other animals
Most insects detect some colors and
movement with their compound
eyes
Shark uses cells in its nasal passages
to detect tiny amounts of blood in
sea water