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19 Cards in this Set
- Front
- Back
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avg:
60% oxygen saturation corresponds to about ___mmHg PO2 |
40
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avg:
97% oxygen saturation corresponds to about ___mmHg PO2 |
100
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How can we shift the saturation vs PO2 curve rightward and downward?
ie, a lower sat corresponds to higher partial pressure of O2 |
H+ ion increase, ph decrease,
incr CO2 Incr temp incr 2,3-BPG (Bohr effect) |
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How can we shift the saturation vs PO2 curve leftward and upward?
ie, a higher sat corresponds to lower partial pressure of O2 |
H+ ion decrease
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enzyme catalyzing:
H2O + CO2 --> H2CO3 |
carbonic anhydrase
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What is the respiratory exchange ratio?
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rate of CO2 output / rate of O2 uptake
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respiratory exchange ratio?
Normals for carbohydrate and fat diets. |
carb diet: R = 1.00
fat diet: R= 0.7 mixed diet: R= 0.825 |
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3 major groups of The respiratory center
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Dorsal respiratory group
Ventral respiratory group Pneumotaxic center |
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"pattern" of breathing: constant inhalation.
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apneustic breathing
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What is the pneumataxic center
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(limits inspiration and therefore can increase ventilatory frequency).
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a strong pneumotaxic signal causes what breathing?
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panting
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respritory group that causes inspiration
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dorsal
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respritory group that causes expiration
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ventral
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when the lungs become overly inflated, the stretch receptors activate an appropriate feedback response that “switches off” the inspiratory ramp and thus stops further inspiration.
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Hering-Breuer effect
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Central vs peripheral receptors. Which are dominant?
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central
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where are peripheral receptors?
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carotid bodies and aortic arch
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where are central receptors?
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brain, CSF
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What are central recptors sensitive to?
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H+ ion.
BBB does not leet H+ ion to get across, but CO2 can get across and mingle with carbonic anhydrase thus forming H+ |
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Why are Effects of low oxygen minimal until very low levels are reached if carbon dioxide and hydrogen ion are normal? What does this mean?
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central receptors
(incomplete answer) |
