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19 Cards in this Set

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  • Back
Where does gas exchange occur in the lungs?
Air sacs (alveoli)
What are the six layers under alveolar capillary (in the correct order)?
1. Type I
2. Type II (surfactant)
3. Alveolar epithelium
4. Epithelial basement membrane
5. Capillary basement membrane
6. Capillary lumen

Then red blood cell...
What is the equation for Dalton's law of partial pressure?
Total pressure x Fractional gas concentration
What is the partial pressure for pulmonary artery?
O2= 40 mmHg

Co2= 46 mmHg
What is the partial pressure for pulmonary veins?
O2= 100 mmHg

Co2= 40 mmHg
What is Fick's Law?
Diffusion of gases
What does the diffusion rates of O2 and Co2 depend on?
The partial pressure differences across the membrane and the area available for diffusion
What is tidal volume (TV)?
The volume inspired or expired with each normal breath
Which lung volume is used during exercise?
Inspiratory reserve volume (IRV)
What is residual volume?
The volume that remains in the lungs after a maximal expiration.
Which lung volume can not be measured by spirometry?
Residual volume
What is the most important muscle for inspiration?
The diaphragm
T of F

The external intercostals and accessory muscles are used for inspiration
False
What are the external intercostals and accessory muscles used for?
exercise
T of F

When contraction of the diaphragm occurs the abdominal contents are pushed up.
False
Why is expiration normally passive?
The lung chest wall system is elastic, it returns to it's resting position after inspiration.
When are expiratory muscles used?
During exercise or when airway resistance is increased b/c of disease
What does the abdominal muscles do?
Compress the abdominal cavity, push the diaphragm up, and push the air out of the lungs
What do the internal intercostal muscles do?
Pull the ribs downward and inward