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Parasympathetic and Sympathetic Nervous System EHS Unit 4

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Description and function of the PSNS and SNS divisions of the Autonomic Nervous system.

Veröffentlicht in: Gesundheit & Medizin
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Parasympathetic and Sympathetic Nervous System EHS Unit 4

  1. 1. Sympathetic and Parasympathetic Nervous Systems EHS unit 4
  2. 2. Learning Targets • Describe the opposing functions of the parasympathetic and sympathetic divisions of the autonomic nervous system.
  3. 3. Autonomic Nervous System, Review • This is the automated system that controls our vital functions. – Modifies heart and respiratory rate – Controls smooth muscles through out the body – Controls processes of digestive, urinary, and reproductive systems. – Controls functions of glands through out the body.
  4. 4. Parasympathetic Nervous System • The “rest and digest” or “feed and breed” system. – Opposed by the sympathetic nervous system. • Major pathways: – Cranial nerves III, VII, IX – Vagus Nerve** – Pelvic Splanchnic Nerve
  5. 5. Neurotransmitters in the PSNS • The PSNS uses Acetylcholine as it’s primary neurotransmitter. – It is used to stimulate the smooth muscles in the vital organs. – Other chemicals used to stimulate excretion are used as well.
  6. 6. Functions of the PSNS • Again, Rest and Digest + Feed and Breed. – This is the “chill” nervous system. • It encourages our digestive and urinary tracts to do their jobs by increasing blood flow to them. • It increases secretion in the mucous membranes. • Sexual response is rooted in this system. • Heart rate and respirations are slowed to resting rates. • Helps to initiate sleep.
  7. 7. Sympathetic Nervous System • This is the “freak out” or “fight/flight” response system. – This system is in control when we perceive danger, urgency, or anxiety. • Major Pathways for this system: – Sympathetic Pathways are primarily from T1 (thoracic) to L2 (lumbar).
  8. 8. Neurotransmitters of the SNS • The SNS relies on several neurotransmitters to functions. – Epinephrine and Norepinephrine (adrenalines) Adrenaline is a hormone and a neurotransmitter. – ACH is also used to stimulate sweat glands, etc.
  9. 9. Actions of the SNS • Fight or Flight + Freak Out Response – When we perceive a threat: • Diverts blood away from the digestive, reproductive, and urinary tracts to the muscles, brain and heart. • Slows mucous production. • Increases heart and respiratory rate. • Blood pressure increases • Pupil dilate • Sets our sensory receptors on “alert”
  10. 10. Working Together for Homeostasis • At any given time, both systems are working. But, one may be “in charge” in the moment. – Sympathetic response is necessary for our survival. It also feels exciting. We sort of like it and getting amped up is healthy from time to time. – Too much “fight or flight” means the body cannot digest, rest, and heal effectively. It also makes the heart work too hard. Long term stress can disrupt the body’s function. – Too much “rest and digest” makes us lethargic, under stimulated, and can lead to weight gain or depression.

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