SFOS 20/21

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Author:
zf2010
ID:
80238
Filename:
SFOS 20/21
Updated:
2011-04-17 20:04:06
Tags:
Reflex Control Cardiovascular Function
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Description:
SFOS 20/21
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  1. Define homeostasis
    Maintaining blood pressure
  2. What kind of receptors respond to blood pressure?
    Mechanoreceptors - respond to stretch
  3. What are the type of mechanoreceptors in the arteries? Heart chambers?
    • Arteries - baroreceptors
    • Heart - cardiopulmonary receptors
  4. Where does integration of regulatory information occur?
    • Brainstem - upper medulla
    • Secondary - spinal cord
  5. Where are baroreceptors most sensitive
    Carotid sinus, aortic arch
  6. Transmural pressure
    Pressure differential across a vessel wall
  7. What is the dominant effector in baroreceptor reflex?
    • Sympathetic NS
    • Decreases excitation with increased pressure
  8. How does sympathetic NS activity effect venous return
    Increased excitation --> increased venous return
  9. How does parasympathetic effect heart?
    • Heart rate decrease
    • Small decrease in contractility
  10. Describe endocrine role in baroreceptor reflex
    • Adrenal gland releases norepinephrine
    • NE increases heart rate and contractile state
    • Kidney releases angiotensin (vasocontrictor)
    • Hypothalamus releases vasopressin (vasocontrictor)
  11. What are the purpose of atrial mechanoreceptors?
    Supply information as to volume state of venous system
  12. Receptors and roles in atrium
    Type A - detect stretch during atrial contration (A wave)

    Type B - detect stretch during atrial filling (V wave)

    Both modulate release of vasopressin, ADH
  13. CNS ischemic reflex
    Sympathetic vasoconstriction with increased heart rate in response to poor CNS perfusion
  14. The Cushing Response
    • Vasocontriction with Vagal bradycardia
    • Caused by CSF pressure is close to MAP
  15. Diving Reflex
    • Exposure of nasopharynx (CN V) to wet/cold
    • Bradycardia and vasoconstriction to non-essential organs

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