Phys #8.txt

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What center in the medulla controls inspiration?

DRG
What center in the medulla controls expiration?

VRG
How many breathing centers are in the medulla?

3
How many breathing centers in the pons?

2
For the Medullary DRG, what are its chemoreceptors and mechanoreceptors?
- Chemoreceptors (for O2): CN IX, X
- Mechanoreceptors: CN X
What nerve does the Medullary DRG utilize to set diaphragmatic breathing?

Phrenic
What is the function of the pneumotaxic center and where is it located?
- function: inhibit medullary DRG inspiration
- Location: PONS
When is the VRG active and why?
- During exercise
- **b/c expiration is normally passive
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
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
What is the function of the drug Ketamine?

activate Apneusis
What do Central Chemoreceptors monitor?

CSF Hydrogen levels, pH, PCO2
What are the two Peripheral Chemoreceptors?

Aortic and Carotid
What do Peripheral Chemoreceptors monitor?

PO2, PCO2, arterial pH
What is the difference b/t the aortic and carotid peripheral chemoreceptors?

Arterial pH only monitored by carotid receptors
What is the only mechanoreceptor to decrease breathing?
1) Lung
2) Joint & Muscle
3) Irritant
4) Juxtacapillary (J)

1) Lung

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Author

kepling

73575

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Phys #8.txt

Description

Phys #8

Updated

2011-03-17T23:48:20Z

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