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The human body is a complex and highly intricate machine. It consists of an estimated 37 trillion cells, which are constantly working together to keep you alive. Your brain, which weighs only about three pounds, controls every single movement your body makes. Even the simplest actions, like breathing or blinking, require coordination between multiple parts of your brain. The heart pumps blood throughout your entire body at a rate of around 100 beats per minute. This blood flow is crucial for delivering oxygen and nutrients to all of your cells. Without it, you wouldn't be able to survive for more than a few minutes. Your digestive system breaks down the food you eat into energy that can be used by your body. It starts with your mouth, where enzymes break down proteins and fats. The partially digested food then moves into your stomach, where acids and enzymes continue to break it down. Your small intestine absorbs most of the nutrients from the food, while your large intestine eliminates waste. Your immune system protects you from infections and diseases by producing antibodies that attack foreign substances. It also has a network of white blood cells that travel through your bloodstream to fight off any invaders.