Resp lect, ch7 west
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What is La places law in respect to the alveoli?
What are the physiologic advantages of surfactant?
- 1. Increased compliance of the lung.
- 2. Increased stability of the alveoli.
- 3. Acts a a barrier to alveolar filling of water.
What are the consequences of loss of surfactant?
- 1. Stiff lungs.
- 2. Areas of atelectasis.
- 3. Alveoli filled with transudate.
What cells produce pulmonary surfactant in the lungs?
Type II alveolar cells.
What is the main ingredient in pulmonary surfactant?
phospholipid, and dipalmitoyl phosphatidylcholine (DPPC).
What does the term interdependence mean in relation to the alveoli?
The elastic properties of the alveoli in contact with one another help resist collapse.
When a person is standing and breathing at normal lung volumes, which area of the lungs is better ventilated? ( apex or base)
At low lung volumes which area of the lung ventilates more effectively? ( apex or base)
With aging, the lungs lose some elasticity and lower airways can collapse at what lung capacity?
Functional residual capacity (FRC).
What determines the combined volume of the chest and the lungs?
Their elastic properties.
The inward pull of the lungs is in balance with the outward pull of the rib cage at _______? (it's a capacity).
Functional residual capacity.
At what volume does the lung contract?
Any volume above minimal volume.
When does the chest wall expand?
At greater than 75 % vital capacity.
Does the density of a gas effect it pressure flow relationship?
No. It is the viscosity of gas that changes the flow relationship.
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