Stairs

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The human body is a complex system that functions as a whole unit, not just individual parts. While each part has its own function, they all work together to keep the body healthy and functioning properly. The brain sends signals to muscles through the nervous system, telling them what to do and when to do it. The heart pumps blood throughout the body, supplying oxygen and nutrients to cells. The lungs breathe in oxygen and expel carbon dioxide, keeping the air clean and fresh inside the body. Every part of the human body plays a vital role in its overall functioning.