tatement credited to Dalton (a dead scientist who figured out things) : \"in a m
ID: 3477614 • Letter: T
Question
tatement credited to Dalton (a dead scientist who figured out things) : "in a mixture of
gases, the total pressure is the sum of the individual partial pressures of gases in the mixture"
is not as important to respiration physiology as ________.
A)
the effects of temperature on a gas play a greater role in respiration than does the gas'
partial pressure
B)
the major gases involved in respiration, oxygen and carbon dioxide, do not diffuse
across membranes but must be transported via active transport receptors on the cell
membranes
C)
the rate of diffusion of a specific gas present in a gas mixture is independent and
unaffected by either the partial pressures of any other gas in the mixture or the total
pressure of all the individual partial pressures of all gases in the mixture
D)
partial pressure is determined by solubility
Explanation / Answer
Answer is
D) partial pressure is determined by solubility
When a mixture of gases is in contact with a liquid, each gas in the mixture dissolves in the liquid to an extent determined by its partial pressure and its solubility in the fluid.
The above situation arises in the lungs, at the alveo-capillary membrane, which forms the interface of the air in alveoli and water of the blood in the pulmonary capillaries.
Thus, the significance of Dalton's Law is somewhat reduced in actual situation inside the body.
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