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9-Autonomic Nervous System Figs BW

Often at 2 division their effects are antagonistic on

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Unformatted text preview: ty). often, at 2 division, their effects are antagonistic on a given organ so final state of organ result in balance of 2 division (Enteric) 3. some textbook think there's 3rd division of ANS: enteric nervous system. they are the nerves within the walls of gastrointestinal tract and its accessory organs and control the function of GI tract (its motility, secretion, local flow of blood). receive info from sympathetic and parasympathetic system, but it operates independently. there's as many neurons in enteric nervous system as there are in CNS. Enteric is a huge division of CNS. * somatosensory & visceral afferents Parasympathetic Sympathetic Responses to / Recovery from Emergencies the general patterns of effector response brought by ANS can be summarize by the following 1. flight or flight: emergencies responses of the body due to sym nerve activity, help prepare body for emergency situation, for action. 1. increase in respiratory rate and depth of respiration. 2. increase in heart rate, which increases blood pressure and state of oxygenation in blood 3. vasodilation (relaxation of vascular smooth muscle) in limb muscles, so more blood can flow into the limb to deliver more oxygen 4.there's also vasoconstriction to restrict blood flow in other areas. the purpose of 3,4 is that circulating blood get shunted away from organs that are not important in immediate survival and toward organ like skeletal muscle and brain that deals with survival...
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