Algonquin College Health Program Assessment (AC-HPAT) Practice Exam

What is the main purpose of respiration?

1. To create energy

2. To sustain life

3. To expel carbon dioxide

4. To maintain body temperature

The correct answer is: To sustain life

The main purpose of respiration is to sustain life. This process is essential for all living organisms as it provides the necessary means for cells to obtain energy from nutrients. Respiration involves the exchange of gases, primarily oxygen and carbon dioxide, which is crucial for cellular metabolism and energy production. Through this process, oxygen is delivered to cells, enabling them to produce energy in the form of ATP (adenosine triphosphate). This energy is then used to fuel various biological functions necessary for survival. While creating energy is a significant aspect of respiration, it is ultimately a part of the larger purpose of sustaining life. Respiration also serves to regulate the levels of gases in the body, ensuring that cells can function optimally, which effectively ties back to sustaining life. The other options, such as expelling carbon dioxide and maintaining body temperature, are important functions related to respiration, but they are secondary to the overarching goal of ensuring the survival and functionality of an organism.