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The human body is a highly complex and dynamic system that is capable of performing an incredibly wide range of functions. From the moment we take our first breath at birth to the time we take our final breath, our bodies are constantly working tirelessly behind the scenes to keep us alive, healthy and functioning optimally. The heart pumps blood throughout the body, supplying oxygen and nutrients to every cell, while the lungs breathe in oxygen and expel carbon dioxide through a process called respiration.