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Human: The human body contains approximately 60 trillion cells. These cells are categorized into different types based on their function and origin, including epithelial, connective, muscle, and nervous tissue. Each type of cell has a distinct role to play in the overall functioning of the body. Epithelial cells form the lining of organs, glands, and other bodily structures, while connective tissue provides support and structure to these tissues. Muscle cells are responsible for movement and contraction, and nervous tissue transmits signals throughout the body. The interaction between different types of cells is crucial for maintaining proper bodily function.