Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
AR/FE/LV
Determinants of airway resistance/forced expirations/lung volumes-CJ- 1/10/13
| Question | Answer |
|---|---|
| Two main forces that oppose air movement | Compliance and frictional resistance |
| What is the predominant resistance to airway flow? | Airway resistance (80%) |
| Sources of viscous resistance | Lung and chest wall as well as diaphragm and abdomen |
| Resistance is measured by measuring the | Pressure drop |
| Equation for measuring resistance | R= Change in pressure/Flow |
| Three types of air flow through airways | Laminar, turbulent, transitional |
| Laminar flow in the lungs is seen in the | Terminal bronchioles |
| Turbulent flow in the respiratory system is seen in the | Trachea |
| Relationship between Radius and Resistance in laminar flow | Resistance is inversely proportional to radius^4 |
| Relationship between radius and length in laminar flow | Resistance is inversely proportional to length |
| An increase in velocity does what to the chance of turbulent flow | Increases |
| An increase in diameter does what to the chance of turbulent flow | Increases |
| An increase in density does what to the chance of turbulent flow | Increases |
| An increase in viscosity does what to the chance of turbulent flow | Decreases |
| The main site of airway resistance in | The medium-sized bronchi |
| Define radial traction | As alveoli expand, they exert tension on airways and pull them open |
| What factors affect smooth muscle tone and affect airway resistance? | Irritants, parasympathetic tone, and B2 stimulants |
| What increases airways resistance in Chronic bronchitis | Hyper secretions of mucus |
| What increases airway resistance in asthma | Increase in smooth muscle ton due to hypersensitivity |
| What increases airways resistance in emphysema | Decreased radial traction and decreased diameter |
| Forced expiration changes the main site of resistance to | Peripheral airways because they are compressed |
| Define transairway pressure | Pressure difference across the airway wall |
| What determines airway patency | Transairway pressure |
| During inspiration and passive expiration, the transaiway pressure is | Positive |
| When you squeeze the lungs, the pleural pressure becomes | Positive |
| What lung volumes cannot be measured by spirometry? | Functional residual capacity, residual volume and total lung capacity |
| Obstructive disorders present with | Increased airway resistance and large lung volumes |
| Restrictive disorders present with | Normal/decreased airway resistance and small lung volumes |
| FEV1 | Volume exhaled in 1st second |
| FVC | Total volume exhaled |
| Normal FEV:FVC | .8 |
| Obstructive FEV:FVC ratio | Less than .8 |
| Restrictive FEV:FVC ratio | Greater than or equal to .8 |
| What factors determine FEV1 | Lung volume, Airway collapse, Airway resistance |
| Forced expiratory flow rate in obstructive disorders is | Lower than 3.5 |
| Forced expiratory flow rate in restrictive disorders is | Greater than 3.5 |
| Flow-volume curve for obstructive disorders presents with a | "Scooped out" area |
| An interthoracic airway obstruction flow-volume curve will be | Flattened on the top (expiration) |
| An extrathoracic airway obstruction flow-volume curve will be | Flattened on the bottom (inspiration) |
| A fixed obstruction flow-volume curve will be | Flattened in both expiration and inspiration |
Created by:
mcasto
Popular Medical sets