The human body is a complex and sophisticated system, composed of multiple organs and systems working together to maintain life activities.The basic structural unit of the human body is the cell. Many cells with similar structures, functions, and origins combine to form tissues. The basic tissues of the human body include epithelial tissue, connective tissue, muscle tissue, and nerve tissue. Different tissues combine in specific forms to form organs with certain functions (such as liver, kidney, heart, brain, etc.). The […]
Human body
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