# Ventilation Chapter 2 review questions

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These are the review questions that start on page 122 in Des Jardins

0.1 L/cm H2O

### Normally, the airway resistance in the tracheobronchial tree is about

0.5-1.5 cm H2O / L / sec

### In the normal individual in the upright position

** the negative intrapleural pressure is greater (ie., more negative) in the upper lung regions
**Ventilation is more effective in the lower lung regions
**the intrapleural pressure is always below atmospheric pressure during a normal ventilatory cycle

### When lung compliance decreases, the patient commonly as

*an increased ventilatory rate and *a decreased tidal volume

### When arranged for flow (V), Poiseuille's law states that V is

*directly proportional to P and *inversely proportional to n

### During a normal exhalation, the

*intra-alveloar pressure is greater than the atmospheric pressure and *intrapleural pressure is less than the atmospheric pressure

2-4 mm Hg

3-4 mL/lb

tachypnea

25 L/min

### The difference between the alveolar pressure and the pleural pressure is called the

transpulmonary pressure

20 cm H2O

### If alveolar unit A has one-half the compliance of alveolar unit B, then the

*volume in unit B is two times greater than volume in unit A and *time constant of unit B is twice as long as that of unit A

6375 mL

79 mL/cm H2O

70 mL/cm H2O

### If a patient produces a flow rate of 5 L/sec during a forced exhalation by generating a transairway pressure of 20 cm H2O, what is the patient's Raw?

4 cm H2O / L / sec

### As Raw increases, the patient commonly manifests

*a decreased ventilatory rate and * an increased tidal volume

4mm Hg

### In the healthy lung, when the alveolus decreases in size during a normal exhalation, the

*surface tension decreases and *surfactant to alveolar surface area increases

0 mm Hg

Example: