the nervous system list as many words you can think about having to do with the nervous system…
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The Nervous System List as many words you can think about having to do with the nervous system…. GO ! ! !. Explain what happens when a you kick a soccer ball…. http:// www.brainpop.com/health/bodysystems/neurons /. Nerve cells are called NEURONS. - PowerPoint PPT PresentationTRANSCRIPT
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The Nervous System
List as many words you can think about having to do with the nervous system….
GO ! ! !
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Explain what happens when a you kick a soccer ball…..
http://www.brainpop.com/health/bodysystems/neurons/
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Nerve cells are called NEURONS.They are highly specialized for the transmission of signals from one part of the body to another.
The signal a nerve cell carries is called an IMPULSE.
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The three main parts of a neuron are
The DENDRITES, CELL BODY,
and AXON.
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The CELL BODY contains the cell’s
nucleus, mitochondria, and other organelles.
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DENDRITES are the sensors.
They have branches for receiving
impulses.
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The AXON carries impulses away from
the cell body to another cell.
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The axon is insulated by a fatty substance called
MYELIN.
The myelin sheath increases the strength and speed of
impulses passing along the axon.
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IMPULSE PATH
Dendrites Cell Body Axon Terminal Branches
An IMPULSE is an electric signal passed through the axon.
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Dendrites Cell Body Axon Terminal Branches Dendrites Cell Body Axon Terminal BranchesDendrites Cell Body Axon Terminal Branches
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The Synapse is where an impulse passes from one
cell to another.
Chemicals called NEUROTRANSMITTERS
are released to allow the signal to cross the gap.
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Receptors must must match the
neurotransmitter.
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Our brains are always making new
connections between neurons.
This is how we get smarter……
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There are three types of neurons;
• SENSORY NEURON• INTERNEURON• MOTOR NEURON
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An IMPULSE signal is started when a RECEPTOR
receives information from the somewhere.
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1. A RECEPTOR receives information from the outside
environment.
This information is called a STIMULUS.
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2. The stimulus initiates an impulse along a SENSORY NEURON.
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3. An impulse reaches the brain, where it crosses to an
INTERNEURON.
4. The interneurons process and decipher the information.
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A new impulse is started in the brain.
5. The new impulse travels along a MOTOR NEURON to a muscle
that will respond.
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6. Muscles and glands that respond to impulses are
called EFFECTORS.
In order to respond to the stimulus
muscles contract orglands secrete.
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http://www.youtube.com/watch?v=FMJJpbRx_O8&feature=related
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In the HYDRA, impulses do not follow a direct
pathway.
The hydra has a NERVE NET of interconnected
neurons.
When the hydra is in danger, its entire body
responds by contracting.
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More advanced animals have a CENTRAL NERVOUS SYSTEM that shows CEPHALIZATION –
the development of a head with a brain.
A CENTRAL NERVOUS SYSTEM includes
1. BRAIN
2. NERVE CORD
3. BRANCHING NERVES
4. SENSE ORGANS
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The earthworm has a VENTRAL NERVE CORD
and many branching nerves.
Ganglia in each segment help pass the impulses throughout the worm’s
body.
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The grasshopper’s nervous system is
similar to the earthworm’s.
There is a head with a simple brain, a ventral nerve cord, and many
branching nerves.
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But the grasshopper has more advanced sensory organs than
the earthworm.
On the head, there are antennae,
two types of eyes, and tasting organs
called PALPS.
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And on the first abdominal segment,
there is a pair of hearing organs called TYMPANAE.
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The human nervous system also
includes a brain, a nerve cord,
branching nerves and sense organs.
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