Chapter 48 - 49 Focus Questions

Chapter 48 - 49 Focus Questions - LexiNix 1 (CNS (PNS 2...

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Lexi Nix Chapter 48-49 Focus Questions 1. What are the two divisions of the nervous system? Central Nervous System (CNS)  Peripheral Nervous System (PNS) 2.What are the three major functions of the nervous system? Sensory -- Detect changes inside & outside of the body Motor  -- Act on “decisions” made by sensory and integrative  functions Integrative -- Receive nerve impulses from peripheral nerves to  conduct a sensation 3.List and describe the 3 major parts of a neuron. Cell Body -- Nissl bodies, nucleus (no mitotic division), neurofibrils,  receives signals from the dendrites and sends the signals through  the axon; makes a chemical decision Axon -- extensions that transmit impulses away from the cell body,  singular Dendrite -- extensions that conduct impulses to the cell body, and  are short, numerous, highly branched, main receptor surface
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