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The human body is a complex system of interconnected organs and tissues that function together to maintain overall health and well-being. The brain serves as the control center, processing sensory information and sending signals to muscles and glands throughout the body. The heart pumps blood through a network of arteries, veins, and capillaries, supplying oxygen and nutrients to cells and organs. The lungs extract oxygen from the air we breathe and remove carbon dioxide through a process called respiration. The digestive system breaks down food into nutrients that are absorbed by the small intestine and processed by the liver. The kidneys filter waste products from the blood and regulate electrolyte balance. Human cells are the building blocks of all tissues, with each cell containing genetic material encoded in DNA. This genetic information determines traits such as eye color, skin tone, and susceptibility to certain diseases. The immune system protects against pathogens and foreign substances, producing antibodies that recognize and attack invading organisms. The nervous system transmits signals between the brain and muscles, allowing for movement and sensation. In addition to these systems, the human body also contains many specialized organs such as the liver, pancreas, and thyroid gland, each playing a vital role in maintaining overall health.