Phys #8.txt

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Author:
kepling
ID:
73575
Filename:
Phys #8.txt
Updated:
2011-03-17 19:48:20
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Phys
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Description:
Phys #8
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  1. What center in the medulla controls inspiration?
    DRG
  2. What center in the medulla controls expiration?
    VRG
  3. How many breathing centers are in the medulla?
    3
  4. How many breathing centers in the pons?
    2
  5. For the Medullary DRG, what are its chemoreceptors and mechanoreceptors?
    • Chemoreceptors (for O2): CN IX, X
    • Mechanoreceptors: CN X
  6. What nerve does the Medullary DRG utilize to set diaphragmatic breathing?
    Phrenic
  7. What is the function of the pneumotaxic center and where is it located?
    • function: inhibit medullary DRG inspiration
    • Location: PONS
  8. When is the VRG active and why?
    • During exercise
    • **b/c expiration is normally passive
  9. What are the three nuclei in the VRG of the medulla? functions?
    • Ambiguous: inspire/expire larynx
    • Retroambiguous: inspire/expire main muscles
    • Retrofacialis: inhibit DRG inspiration
  10. What is the function of the Apneusis and where is it located?
    • Function: prolong inspiration, activate DRG phrenic nerve. Causes quick expiration as well.
    • Location: PONS
  11. What is the function of the drug Ketamine?
    activate Apneusis
  12. What do Central Chemoreceptors monitor?
    CSF Hydrogen levels, pH, PCO2
  13. What are the two Peripheral Chemoreceptors?
    Aortic and Carotid
  14. What do Peripheral Chemoreceptors monitor?
    PO2, PCO2, arterial pH
  15. What is the difference b/t the aortic and carotid peripheral chemoreceptors?
    Arterial pH only monitored by carotid receptors
  16. What is the only mechanoreceptor to decrease breathing?
    1) Lung
    2) Joint & Muscle
    3) Irritant
    4) Juxtacapillary (J)
    1) Lung

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