Identify the process indicated by the circle in the figure below. 
Definitions:
Blood Oxygen Levels
A measure of how much oxygen is being carried in the blood, critical for the metabolic processes in the cells.
Regulation of Respiration
The processes involved in controlling the rate and depth of breathing.
Hemoglobin
A protein in red blood cells that carries oxygen from the lungs to the rest of the body and returns carbon dioxide back to the lungs to be exhaled.
Carbon Dioxide
A colorless, odorless gas produced by burning carbon and organic compounds and by respiration. It is naturally present in air and is absorbed by plants in photosynthesis.
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