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The human body is made up of approximately 60 trillion cells that work together to keep us alive and functioning properly. The central nervous system, which includes the brain and spinal cord, plays a crucial role in controlling our thoughts, movements, and sensations. Our skin is the largest organ in the body and serves as a protective barrier against external factors such as bacteria, viruses, and other harmful substances. It also helps to regulate our body temperature and aids in the production of vitamin D when exposed to sunlight. The heart pumps blood throughout the body, supplying oxygen and nutrients to all organs and tissues. The lungs take in oxygen from the air we breathe and expel carbon dioxide through exhalation.