QUESTIONS AND ANSWERS
How is compliance calculated? - ANS Change in volume/change in pressure
Normal lung compliance is approximately which of the following? - ANS 0.2 L/Cm H2O
A lung that loses elastic fibers would exhibit which of the following characteristics? -
ANS Increased compliance
For healthy individuals at rest... - ANS Exhalation will be passive, no use of respiratory
muscles.
What is ventilation that is insufficient to meet metabolic needs and can result in an
acidosis called? - ANS Hypoventilation
When we inhale the pressure inside the lungs are: - ANS Below atmospheric pressure
The intrapleural pressure is always at a: - ANS Negative pressure
The visceral pleura lines the surface of what organ? - ANS Lungs
When we exhale the pressure inside the lungs: - ANS Increases above atmospheric pressure
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, The chest cavity is lined by what membrane? - ANS Parietal pleura
Surface tension is counteracted by what substance? - ANS Surfactant
Calculate the minute ventilation for a person that has a R of 16 and a Vt of 400. - ANS 6.4
L/min
The volume of air measured during either inspiration or expiration that facilitates the
removal of CO2 and replenishes 02 is called: - ANS Tidal volume
The process of moving air in and out of the lungs is called? - ANS Ventilation
What is needed to move gas from one place to another. - ANS Pressure gradients
What forces must be overcome to move air into the respiratory system?
1. Tissue movement
2. Elastic forces of lung tissue
3. Airway resistance
4. Surfactant - ANS 1,2&3
Strong cohesive forces between water molecules in the alveoli create: - ANS Surface tension
During inhalation the diaphragm_________& moves ___________ - ANS Contracts and down
Calculate the minute ventilation for the following. Convert to liters:
RR= 15 breaths per minute
Vt = 600mL - ANS 9.0 L/min
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