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The human body is a highly complex system that functions as a single unit to maintain life and health. The human brain controls all bodily functions through a network of nerve cells called neurons. These neurons communicate with each other by releasing chemical signals, known as neurotransmitters. These signals allow the brain to send messages throughout the body, controlling everything from movement and sensation to emotions and thoughts. The human heart is a muscular organ that pumps blood throughout the body. It beats around 100 times per minute, pumping approximately 2,000 gallons of blood every day. The lungs are responsible for exchanging oxygen and carbon dioxide through the process of respiration. They take in oxygen and expel carbon dioxide, allowing the body to function properly. The human digestive system is responsible for breaking down food into nutrients that can be absorbed by the body. The mouth begins the digestion process by breaking down food into smaller particles with teeth. The tongue then mixes these particles with saliva, which contains enzymes that break down carbohydrates. The stomach further breaks down food with its strong acids and muscles. The human immune system is responsible for protecting the body from diseases and infections. It uses a combination of white blood cells and antibodies to fight off foreign invaders. These white blood cells, such as neutrophils and lymphocytes, work together to identify and destroy infected cells. The antibodies produced by the immune system help to neutralize toxins and prevent infections. The human nervous system is responsible for controlling all bodily functions through a network of nerve cells called neurons. It allows the brain to send messages throughout the body, controlling everything from movement and sensation to emotions and thoughts.