Quiz 4 Physical Princiles of Gas Exchange Flashcards
What is the mechanism and rate of molecule transfer dependent on ?
- Physics of gas diffusion
- Partial pressures of gases involved.
What is the energy source for gas diffusion?
Kinetic motion
Molecular movement is continual and random?
True
Movement of a gas in one direction is the effect of what?
Concentration gradient
Direction of diffusion occurs for areas of ______ to _______ concentration.
High, low
Rate of diffusion is dependent on what?
Pressure
What is partial pressure?
The pressure a gas would exert by it’s self.
What is the total pressure of a mixture?
The summation of all the partial pressures in a gas.
Each gas exerts its own individual pressure on the respiratory wall surface?
True.
What is the mixture of air?
Nitrogen 79%
Oxygen 21%
What is the total pressure of the air mixture?
760 mm Hg
What does 1 atmosphere equal?
760 mm Hg
What is the partial pressure of nitrogen in one atmosphere?
600 mm Hg
What is the partial pressure of oxygen in one atmosphere?
160 mm Hg
What does Henry’s Law say about the solubility of a gas in a liquid?
Depends on the
- temperature
- partial pressure of the gas over the liquid
- nature of the solvent
- nature of the gas
What is high soluble mean?
When dissolved molecules are attracted by water more can be accumulated without building up excess pressure in a solution.
What does poorly soluble mean?
Molecules which are repelled by water will dissolve less and have lower concentration
What is the rate of net diffusion determined by?
Difference of partial pressure (pp).
If the pp of gas in the alveoli greater than blood which way will the gas move?
The gas will move into the blood.
What is the vapor pressure when a gas mixture is fully humidified at 37 C?
47 mmHg.