BIOL-2110 2016-03-22 - BIOL-2110 Lecture 9 Nervous System...

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BIOL-2110Lecture 92016/03/22Nervous SystemPhysiological control -All organ systems require physiological control systems-2 physiological control systems:oNervous system: electrical signals oEndocrine system: chemical signalsNervous system-Responsible for most functions -Distributed throughout body; influences all other systems -Complex aggregation of cells -Communication network and supportive matrix-Neurons oMajor functional unit of nervous system oCommunication network oReceive information and transmit to other cells oHumans have ~ 100 billion neurons-Neuroglial cells oSupportive matrix oProportion increases with evolutionary complexity oMammalian brain has 10x more neuroglia than neurons (probably very important)Neurons-Classified functionally into 3 types 1.Sensory neurons (=afferent neurons) oRelay information collected from external or internal stimuli (e.g., light, sound, blood O2) to integrative centre2.Motor neurons (=efferent neurons) oOutput portion of neuronal circuit o

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