July 27,
2005 Ms. Berrios Human
Biology
The Nervous System
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Functions: Receives and sends information about internal and external changes
Organs:
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Brain:
The main
organ of the nervous system. The brain is made up of billions of nerve cells. |
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Spinal
cord: The
nerve cells that run up and down the backbone sending messages to and from
the brain and the rest of the body. |
The
Basic Neuron types:
1.
Bipolar (interneuron)
2.
Unipolar (Sensory Neuron)
3.
Mutipolar (Motoneuron)
4.
Pyramidal cell
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Nerve Cells:
Cells that carry messages (impulses) are also known as neurons.
Sensory Organs: Respond to physical and chemical stimuli and detect
changes in the body position. The nervous system is connected also to the
sensory system.
Eyes:
Organs of sight with receptors that
respond to light.
Eyes change light patterns (colors, brightness, movement) to electrical impulses that are sent to the brain, which understands them as images.
Ears:
Main
functions of the ears
are
hearing and balance.
The eardrum receives vibrations and transmits them to tiny connective
bones
Nose: The nostrils are used for breathing, smelling, and detecting fire and chemicals.
Tongue: Has chemical receptors that respond to different taste and flavors.
Skin: Has physical receptors and temperature
