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The human body is made up of various organs and systems that work together to maintain overall health and well-being. The human brain, often referred to as the control center, plays a crucial role in regulating bodily functions such as movement, sensation, perception, and cognition. The heart pumps blood throughout the body, supplying oxygen and nutrients to tissues and organs. It beats approximately 100,000 times per day, pumping over two billion times in an average person's lifetime. The lungs are responsible for exchanging oxygen and carbon dioxide through breathing, while the liver filters toxins from the bloodstream and aids in digestion. The human digestive system breaks down food into essential nutrients that are absorbed and utilized by the body. It consists of the mouth, esophagus, stomach, small intestine, and large intestine. The skin protects the body from external damage and regulates body temperature through sweating and shivering. Human emotions such as happiness, sadness, anger, and fear are experienced and expressed in various ways. They can be triggered by internal factors like thoughts and memories or external stimuli like environmental changes.