Body functions refer to the various processes that occur within living organisms to maintain life. These functions include essential activities such as respiration, where oxygen is taken in and carbon dioxide is expelled, and digestion, which breaks down food into nutrients. Other vital functions include circulation, where blood transports oxygen and nutrients throughout the body, and excretion, which removes waste products. Each body function is supported by specific organs and systems. For example, the heart plays a crucial role in circulation, while the lungs are essential for respiration. The digestive system works to process food, and the kidneys help filter waste. Together, these functions ensure that the body operates efficiently and remains healthy.