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| Description: TABLE 36—2 Sympathetic Nervous System’s Fight-or—F ight-Response Physiologic Response Physiologic Rationale Increased heart rate To deliver needed oxygen rapidly Increased respiratory rate To increase tidal volume, thereby increasing available oxygen Increased glycolysis, gluconeogenesis, mobilization of free To increase availability of glucose for energy fatty acids : Decreased urine output To conserve fluid volume; to return more blood volume ' to cardiovascular system to increase volume and blood pressure Decreased blood flow to internal organs (e.g., kidneys, To allow more blood flow to more vital organs (e.g., heart and gastrointestinal tract, liver) lungs) Decreased intestinal peristalsis To shunt blood to vital organs; no need for digestion as body energy is redirected to lifesaving measures Cool skin Alpha receptors produce peripheral vasoconstriction to shunt blood to more vital organs Diaphoresis To release heat as a by—product of metabolism — Picture Stats: Views: 233 Filesize: 259.99kB Height: 776 Width: 1602 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=43919 |