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Autonomic nervous system Chapter 12

Autonomic nervous system Chapter 12 . Joe Pistack MS/ED. Autonomic nervous system. Automatic response-the body’s way of unconsciously and automatically making decisions and carrying them out for you.

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Autonomic nervous system Chapter 12

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  1. Autonomic nervous systemChapter 12 Joe Pistack MS/ED

  2. Autonomic nervous system • Automatic response-the body’s way of unconsciously and automatically making decisions and carrying them out for you. • The autonomic nervous system-is part of the peripheral nervous system that supplies motor activity to the visceral effector organs, glands, smooth muscles within the organs and the heart.

  3. Divisions of the ANS • The two divisions of the ANS are: • sympathetic • Parasympathetic • Dual Innervation a single organ receives nerve fibers from both divisions of the ANS • Sympathetic nervous system- is activated during periods of stress or times when a person feels threatened. • Called the “fight or flight” response.

  4. Sympathetic nervous system • Causes you to either confront (fight) or remove yourself from the threatening situation (flight). Sympathetic nervous system is activated during periods of stress, normally short-lived periods.

  5. Fight or flight

  6. Fight or flight

  7. Sympathetic Response • Heart rate increases • Bronchial tubes dilate(increase airflow) • Iris of the eye dilates (pupils enlarge) • Blood vessels constrict • Sweat glands stimulated • Inhibited intestinal mobility • Adrenal medulla stimulates secretion of epinephrine and norepinephrine • Salivary glands stimulate thick secretions

  8. Parasympathetic nervous system • Parasympathetic nervous system-most active during quiet, non-stressful conditions. • Has a calming effect on the body. • Plays an important role in the regulation of digestion and reproductive function. • Referred to as “feed and breed” or resting and digesting.

  9. Parasympathetic nervous system • The parasympathetic system is activated in situations that are perceived hopeless and where “fight or flight” seems futile. • Symptoms are the opposite of sympathetic nervous system • Body’s reaction to a more restful situation. Ex. Nice spring day, sitting under a tree.

  10. Parasympathetic Response • Decreased heart rate • Bronchial tubes constrict • Pupils Constrict • Salivary glands are stimulated with a watery secretion • Increased motility and secretion of the intestine

  11. Parasympathetic Response • Stimulus that can effect the parasympathetic nervous system may be stimulation of the vagus nerve, diagnostic testing that may stimulate a parasympathetic response. Ex. Colonoscopy. • A massive parasympathetic response may result in uncontrolled urination or defecation. • Bradycardia

  12. As we age • There is a decrease in the speed of nerve conduction. • Decrease in reflexes. • Less efficient sympathetic nervous system response may cause transient hypotension and fainting. • Decline in nerve activity supplying changes in pupillary response and reactivity. • Decrease in the cranial nerves mediating taste and smell.

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