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The human body is a highly complex and intricate machine that requires regular maintenance to function at its best. The brain, often referred to as the central processing unit of the body, uses approximately 20% of the body's total energy expenditure while only accounting for about 2% of the body's overall mass. This highlights just how vital the brain is to our daily lives and why it needs to be properly taken care of. The human heart beats around 3 billion times in a person's lifetime, pumping over 1 million barrels of blood through its chambers each year. The heart's ability to pump blood throughout the body without rest is truly remarkable and underscores the importance of keeping this vital organ healthy. Human skin is the largest organ of the body and plays a crucial role in protecting us from external factors such as infection, temperature fluctuations, and injury. It also helps regulate our bodily functions by controlling sweat production and regulating body temperature. In addition to its protective functions, human skin also contains tiny glands called sebaceous glands that produce an oily substance called sebum, which helps keep the skin hydrated and supple.