Certified Wildlife Rehabilitator Practice Test

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How is CO2 primarily expelled from the body?

In feces
Through sweat
During respiration
In urine

The correct answer is: During respiration

The primary method by which carbon dioxide (CO2) is expelled from the body is through respiration. When we breathe in, our bodies take in oxygen, which is then transported to the cells to facilitate metabolic processes. During these processes, CO2 is produced as a waste product. As the body requires the removal of this waste, we expel CO2 during exhalation. The exchange of oxygen and carbon dioxide occurs in the lungs, where oxygen from the air is absorbed into the bloodstream, and CO2 is released from the blood to be exhaled. This respiratory process is critical for maintaining homeostasis within the body and ensuring that the levels of gases are kept in balance. Other methods such as excretion in feces, sweat, or urine are not significant pathways for CO2 removal. These processes primarily help to eliminate other waste products, while respiration is specifically designed for gas exchange, making it the key mechanism for expelling carbon dioxide.