Respiratory System Flashcards
What kind of pressure is produced with the contraction of the diaphragm?
A negative pressure in the space between the lungs and the abdominal wall
Normal inhalation is what kind of process?
Active
What drives inhalation?
Contraction of the diaphragm
Normal exhalation is a
Passive process
A forced expiration generates
Additional force on the air within the lungs
Air flows from areas of
Higher pressure to lower pressure
How is pressure during expiration?
Greater than that of atmospheric air
What is the pressure of gas within the alveoli at the peak of inspiration, just before expiration, relative to that of atmospheric air?
The same
Henry’s law states that the amount of gas that dissolves in a given liquid is directly proportional to the
Partial pressure of the gas in equilibrium with that liquid
Which gas is more soluble in the blood?
CO2
Fick’s law describes the
Rate of diffusion of particles across a membrane
What does Fick’s Law consider?
- Wall thickness
- Wall Surface Area
- Pressure gradient across the wall
- Diffusion constant of the molecule
What increases the pressure of the alveolar wall on the gas within the alveolar space?
- Increased lung elastic recoil
- Increased alveolar surface tension
What would allow for easier diffusion of gasses between these spaces?
- Decreased interstitial thickness
- Decreased alveolar/capillary wall thickness
What affects hemoglobin saturation?
- Presence of Oxygen to saturate hemoglobin
- Physiological factors which affect Hb’s oxygen affinity
