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The Nervous System - outline

The Nervous System - outline - Jacob Zipperstein The...

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Jacob Zipperstein The Nervous System Unit Seven – Section 48 – Page 1022 I. Overview of Nervous System a. The nervous system has three overlapping functions i. Sensory input ii. Integration iii. Motor output b. Central Nervous System (CNS) i. Consists of the Brain and Spinal Chord ii. Motor output is the conduction of signals from the CNS to effector cells. iii. Effector cells – the muscle cells or the gland cells that carry out the body’s responses to stimuli. c. Nerves i. Bundles of individual nerve fibers held together by connective tissue ii. Peripheral Nervous System (PNS) 1. Nerves that communicate motor and sensory signals between the CNS and the rest of the body II. Neurons a. The structural and functional unit of the nervous system i. Has a cell body which contains the nucleus b. Dendrites – short and highly branched that receives and processes incoming information from other cells and carries this information as a signal to the cell body c. Axons – longer then dendrites. Electrically sends outgoing messages from the cell body to other cells in the body. i. A neuron can have many dendrites but never has more than one axon.
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