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The Nervous System

The nervous system as a machine

Describe sensory input Sensory receptors located outside the CNS gather sensory info. The receptors transduce some form of energy that originates outside the body, and then sensory neurons carry this info into the CNS.
Describe what sensory transduction is The conversion of energy into movement of ions across a membrane.
What are the different types of energy? Electromagnetic - visible light. Mechanical - touch, the ear picking up sound wavelengths. Chemical - use energy in the shape of molecules, taste & smell
Describe integration The processing of sensory information, and the selection of a response which occurs entirely in the CNS. Results when electrical signals are transferred among neurons at the synapses.
Describe motor output After the information is processed, the NS elicits a response by activating an effector organ (either muscles or glands). Originates in the CNS, but the response is elicited by actions in the PNS.
What does the central nervous system consist of? The brain and the spinal cord
What does the peripheral nervous system consist of? All portions of the nervous system that exist outside of the central nervous system. Much of it consists of nerves that carry both sensory and motor information.
What are nerves? Bundles of nerve processes in the peripheral nervous system.
What are tracts? Bundles of axons in the central nervous system.
What is the job for sensory neurons? They originate in the body and bring information to the central nervous system about the skin, skeletal muscles and joints.
The nerve cells carrying the information from the body to the CNS are called: Somatic afferents
What are the afferents called that originate in organs such as intestines? Visceral afferents
Explain what the motor division of the peripheral nervous system does This division of the PNS brings about a response. Is also called the efferent division.
Created by: cassidylm34



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