The following graph is _______________. 
Definitions:
Respiratory Variables
Measurements and factors that characterize the functioning of the respiratory system, such as lung volume and breathing rate.
Minute Respiratory Volume (MRV)
This refers to the total volume of gas that is inhaled or exhaled from a person's lungs in one minute.
Expiratory Reserve Volume (ERV)
The extra volume of air that can be expelled with force following a regular, gentle breath out.
Predicted Vital Capacity
The calculated amount of air a person can expel from their lungs after a maximal inhalation, based on factors like age, gender, height, and ethnicity.
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