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8 Cards in this Set

  • Front
  • Back
What makes up the nervous system?
the system of nerves which includes the brain, the nerves, and the spinal cord
What are nerves?
the fibers that carry messages to and from the brain
What is the spinal cord?
a bundle of nerves found in the backbone
What are sense organs?
the parts of the body that are designed to help you react to things around you
What is the iris?
the colored part of the eye that controls the size of the pupil
What is the pupil?
the black hole in the center of the eye that becomes smaller or loarger to control the amount of light that enters the eye
What is the optic nerve?
the nerve which carries the message of sight to the brain
What is the definition of vibrate?
to move rapidly back and forth