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The human body is a complex and intricate machine that is capable of performing a wide range of functions, from movement to growth and development. The human brain is responsible for controlling many of these functions, including thought, emotion, and movement. It is made up of billions of nerve cells called neurons, which communicate with each other through electrical and chemical signals. The human body has five senses: sight, sound, touch, taste, and smell. Each sense is used to gather information from the environment and process it in the brain. The eyes see light and color, the ears hear sound waves, the skin feels texture and temperature, the tongue tastes food and drink, and the nose smells odors. Humans also have a number of organs that work together to keep them alive. The heart pumps blood throughout the body, supplying oxygen and nutrients to cells and tissues. The lungs breathe in oxygen and release carbon dioxide. The liver filters waste products from the blood and produces bile to aid digestion. The kidneys filter waste products from the urine and regulate the balance of fluids in the body. In addition to these basic functions, humans have a number of specialized systems that help them interact with their environment. The nervous system transmits signals between different parts of the body and enables movement and thought. The circulatory system transports oxygen and nutrients throughout the body. The digestive system breaks down food into its component parts and absorbs nutrients.