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In a situation where one small bronchus is obstructed, the air in that segment of the lung will develop a high partial pressure of carbon dioxide and a low partial pressure of oxygen. What changes in ventilation and perfusion will occur in that segment in response to this condition?
Internal Validity
The extent to which a research study accurately establishes a cause-effect relationship between the treatment and the observed outcome, minimizing the confounding variables.
Random Assignment
A method used in experiments where participants are allocated to different groups purely by chance, minimizing bias and equalizing other variables.
Experimental Design
A research strategy that involves manipulating one or more variables to determine their effect on a dependent variable while controlling other factors.
Maturation
The process of growth or development over time, which can influence outcomes in longitudinal studies due to naturally occurring changes within the subjects being studied.
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