HUBS1403 Lecture Notes - Lecture 22: Central Nervous System, Somatic Nervous System, Peripheral Nervous System

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Lecture 22: overview of the nervous system: list the major divisions of the nervous system and describe their function. Ans sympathetic speeds heart rate while parasympathetic slows it. Brain responsible for integrating, processing and coordinating sensory data and motor commands: complex integrative functions: vision, hearing, consciousness, memory. Spinal column relays info to the brain, directs simple involuntary activities such as reflexes. The cns is encased in its own interstitial fluid (csf) separated by the blood-brain barrier: lets gases (o2 and co2), oil soluble eg ethanol, anaesthetics. Peripheral nervous system transmits sensory info to the cns and delivers motor commands to peripheral organs. Motors: skeletal muscles, cardiac muscles and glands, afferent carries into the cns (sensory neurons, efferent carries info from the cns (motor neurons, s. a. m. e. Divisions of efferent: somatic nervous system: sends signals to (innervates) skeletal muscles both voluntary and involuntary (reflexes, autonomic (visceral) nervous system (ans) innervates everything else involuntary, divisions of ans, sympathetic and parasympathetic speed/slows.

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