Ch16NotesSum11

Ch16NotesSum11 - Ch. 16 Neural Integration II: The ANS The...

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1 Fig. 16-1, p. 529 Ch. 16 – Neural Integration II: The ANS •T h e autonomic nervous system (ANS) – our main focus for this chapter – It makes routine homeostatic adjustments in physiological systems • E.g. internal temperature, electrolyte concentrations, metabolism, etc. – It subconsciously coordinates cardiovascular, respiratory, digestive, urinary, and reproductive functions Higher-order functions : interesting reading at the end of the chapter, but we won’t be covering
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2 Fig. 16-2, p. 530 Comparing the SNS and ANS An overview of the ANS • It is made up of : – Autonomic nerves – Autonomic ganglia – Autonomic plexuses • It is controlled by lower brain centers located in the : – Hypothalamus –B ra in s tem • It has 2 subdivisions : –1 . Sympathetic division “fight or flight” • It prepares the body for a heightened level of somatic (physical) activity in order to deal with a threat, crisis, or stress –2
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3 How might sympathetic activation help you deal with this situation? Functions of the sympathetic division • It’s a.k.a. “fight or flight”, thoracolumbar division, “E” division (excitement, exertion, embarrassment, exercise, emergency, energy-expending, euphoria, etc.) • Ask yourself: for each organ innervated, what type of response will assist my immediate chances of surviving a potentially life-threatening threat or crisis? • Some examples of sympathetic activation (see Table 16-3 for more) : Mental alertness Metabolic rate of all body cells Respiration rate, dilate bronchioles HR, BP, and blood flow to the muscles, skin, heart, and lungs Sweat gland activity – Dilate pupils Digestive and urinary functions Blood flow to the digestive viscera and kidneys – Release of energy reserves
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4 Functions of the parasympathetic division • Is a.k.a. “rest and digest”, “rest and repose”, craniosacral division, “D” division (digestion, diuresis, defecation), “SLUDD” division (salivation, lacrimation, urination, digestion, defecation), “anabolic system”, vegetative, restorative • Ask yourself: for each organ innervated, what type of response will assist your body’s maintenance/upkeep and help it to rest and recover from times of stress? • Some examples of parasympathetic activation (think opposite of sympathetic activation; see Table 16-3 for more) : – *Blood diverted back to the digestive viscera and kidneys – Constrict pupils Digestive gland secretion and digestive tract motility – Absorb nutrients, synthesize and store energy molecules Airway diameter and respiration rate
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Ch16NotesSum11 - Ch. 16 Neural Integration II: The ANS The...

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