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22 Cards in this Set
- Front
- Back
3 areas of respiratory control
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central control - sensor and effector
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What group of neurons are the principle ones in inspiration?
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Dorsal respiraotry group
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when are dorsal respiratory group neurons active?
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inspiration
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when are ventral respiratroy group neurons active?
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expiration
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what group of neurons are the principle ones in expiration?
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ventral respiratory group
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How is the hypothalamus involved in breathing?
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autonomic - ie animals panting to reduce body temp
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What are the main central sensors for ventilation regulation
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chemoreceptors in the base of the brainstem/medulla
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what is the stimulus for the central chemoreceptors of ventilation?
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a DROP in pH (H+ ions)
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Is CO2 a stimulus for the central chemoreceptors of ventilation?
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NO - H+ is, thru the reation of Co2 w/ H2o
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An increase in Co2 in blood causes what?
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increased ventilation thru increased blood pH
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What are the 2 peripheral sensors for ventilation?
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carotid and aortic bodies
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carotid bodies project to the DRG of brainstem via what?
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glosoph nerve
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aortic bodies project to the DRG of brainstem via what?
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vagus nerve
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What are the 3 stimiuli for the PERIPHERAL sensors of ventilation? (in order of importance
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LOW arterial pO2
Hypercapnia (increased PaCo2) Acidosis |
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what is more important to regulating ventilation (80% to 20%) CNS or PNS?
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CNS
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what is the adequate hypercapnia stimulus for peripheral? > what?
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45 mmHg
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What is the adequate acidosis pH for periph. sensors?
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<7.35
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What is the hering breuer reflex?
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a large stretch of the lungs inhibits inspiration
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How do irritants like smoke or cold influence ventilation rate?
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increase it
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Overall effects on ventilation: rank the 3 factors
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1. co2
2. o2 3 ph |
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what is the co2 breaking effect
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when po2 drops, at a certain point the body will rid itself of Co2 and therefore Ventilation inrease is not as strong
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How do gas levels remain pretty constant during excercise?
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the CORTEX anticipates it at beginning of excercise, and drives down pCO2/increase Ventilation
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