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The human body is a complex and intricate machine that is capable of performing a wide range of functions. From the moment we are born until the day we die, our bodies undergo countless changes as we grow and develop. Our brains are responsible for controlling our movements, thinking, and emotions. They process information from our senses and send signals to our muscles, telling them what actions to take. The heart is a vital organ that pumps blood throughout our body. It beats around 100,000 times per day, pumping over 2,000 gallons of blood every 24 hours. The lungs are responsible for taking in oxygen and expelling carbon dioxide from the air we breathe. They expand and contract with each breath, allowing us to take in the oxygen our bodies need. Our skin is a protective barrier that keeps us safe from the outside world. It protects us from injury and infection, and helps regulate our body temperature. The digestive system is responsible for breaking down food into nutrients that can be absorbed by our bodies. It starts with the mouth, where teeth break down food into small pieces, and continues through the esophagus, stomach, and intestines. Overall, the human body is an amazing machine that is capable of performing a wide range of functions.