Term
| Do Oxygen and Carbon dioxide exchange for one another? |
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Definition
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Term
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Definition
- Gas exchange- Moves 02 into blood- Removes Co2 from blood
- Blood Storage
- Regulate Vasoconstricting Substances- Brdykin, ACE, Heparin
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Term
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Definition
- Chest expands and sucks air in- movement of muscles is what causes you to breath!!!!!!!
Inspiration- decrease pressure increase space
Expiration- Increase pressure decrease space |
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Term
Compliance of lung Depends on
Has to be able to stretch and recoil |
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Definition
- Elastin & Collagen Fibers
- Water content
- Surface tension
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Term
Compliance: Elastic Stretch & Recoil
Empysema
Normal
Fibrosis
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Definition
Empysema-stiff lung-stretch does not recoil
Normal-stretch recoil =
Fibrosis-harg lung- can not stretch |
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Term
What controls Surface tension?
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Definition
- Surfactant- created by type 2 alvero cells- keep lung from collapsing- controls water surface tension
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Term
-Work of breathing-
- How is air xchange meassured
- Stiff non-compliant lung
- Obstructive airways
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Definition
- TV x Resp rate=normal 6000ml
- keep TV low & increase rate
- Take deeper breath at a slower rate
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Term
Dead Space?
2Types of Shunting? |
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Definition
- Anatomic Dead Space- normal- Air that does not reach exchange level 30% of tidal volume
- Physiologic dead space-abnormal- air gets to alveolus but 0 xchange= shunting
- Anatomic-obstuction alveoli blocked
- Physiologic- Alveolus dysfunctional inadequete perfusion d/t edema, excessive secreations
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Term
| 3 Points of Respiration... Must have these to have good respiration |
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Definition
- Ventilation-has to get in and out (movement)
- Perfusion- must have good blood flow
- Diffusion- need to have normal alveolus
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Term
A. Normal Unit
B. Dead Space
C. Shunt unit |
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Definition
A. Normal vent/perfusion
B. Not exchanging= Vent>perfusion ie. Pulm emoblism/infaction
C. Perfusion>Vent |
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Term
How are you perfusion zones effected?
1=minimal perfusion
2= intermediated- go up stairs
3=continuous- sitting- most take place here |
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Definition
| Zones are effected by how the patient is laying/position= this is why we must keep out patient moving |
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Term
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Definition
- Position-upright perfusion decreased
- Hemodynamics- BP/V
- Increased Perfusion Exercise- recruitment & destention
- Hypoxic Vasoconstriction-
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Term
During running or increase excersie what happens in lungs
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Definition
| Distention & recruitment= pull more fluid to get better perfusion in lungs |
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Term
Movement of gases across the alveolar cap membrane
What affects this
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Definition
Diffusion
- gass pressure
- available surface area
- membrane thickness
- characteristics of gas
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Term
| How does 02 move from Alveolus? |
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Definition
- 02 from Alveolus to cap along concentration gradient
- 02 not easily dissolved in plasma
- inside cap 02 moved to RBC to combine with HG
- 02 Dissociated from HG to where cap has lower 02
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Term
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Definition
- 5% Disolved in Plasma
- 20% carried by HG
- 75% work in buffer system= CARBONIC ANHYDRASE ALLLOWS THIS to maintian into buffersystem to keep our ph in control.
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Term
Neural Control of Resp- Resp center controlled by?
2 groups that control this? |
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Definition
- Dorsal Group- inspiration- control phrenic nerve diaphram
- Ventral group- inspir & exspir- spinal motor neurons (inercostal &adominol)
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Term
Chemoreceptors Adjust Resp Rate
- Central Chemoreceptors
- Peripheral Chemoreceptors
What looks for 02? |
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Definition
- Measure PH in cerrebrospinal fluid- increase resp when ph decreased -resp center in brain if acidotic(stimulus) increase rate a little bit, but will only do this for awhile(COPD lose this)
- Carotid &Aoric bodies meassure PO2 in arterial blood, increase resp when Po2 <60. HYPOXIA STIMULUS
- Chemoreceptors
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