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PSL300 past exam

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University of Toronto St. George
Michelle French

Chapter 13 integrative physiology I control of body movementNeural reflexesSensory receptors code sensory information and send it to the CNS where it is integratedReflex the integration of sensory information into an involuntary response oThe pitcher processes other information at the subconscious level and acts on it without conscious thoughtoShifts his weight to offset the impending movement of his armBegin with a stimulus that activates a sensory receptoroSensor sends info in the form of AP thru sensory afferent neurons to the CNSoCNS is integrating centre that evaluates all incoming info and selects appropriate responseIt then initiates AP in efferent neurons to direct the response of muscles and glandsthe targetsFeedback signals from muscle and joint receptors keep the CNS continuously informed of changing body positionoNegative feedbackoFeedforward Ex brace yourself in anticipation of a collisionNeural reflex pathways consist of chains or networks of neurons that link sensory receptors to muscles or glandsoBy efferent division of the nervous system that controls the responseSomatic reflexesReflexes that involve somatic motor neurons and skeletal musclesThe somatic nervous system SoNS or voluntary nervous system is the part of the peripheral nervous systemassociated with the voluntary control of body movements via skeletal muscles The SoNS consists of efferent nerves responsible for stimulating muscle contraction including all the nonsensory neurons connected with skeletal muscles and skin Automoic reflexesReflexes whose responses are controlled by autonomic neurons Control smooth and cardiac muscle glands and adipose tissueThe autonomic nervous system ANS or visceral nervous system or involuntary nervous system is the part of the peripheral nervous system that acts as a control system functioning largely below the level of consciousness and controls visceral
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