TOMOVINKOVIČ 523

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The human body is a complex and fascinating machine that has been studied for centuries. It consists of many different systems, including the nervous system, circulatory system, and respiratory system, which work together to keep us alive and healthy. Each day, our bodies take in oxygen from the air we breathe and use it to fuel our cells. This process is called cellular respiration, and it's essential for producing energy for all of the body's functions.