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 […]
Daily Archives: 2026Asia/ShanghaipmSun, 04 Jan 2026 16:11:17 +0800 2026, Jan202613104 1, Sunpm26 4
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1、 The engine of respiration: Understanding the respiratory musclesThe lungs cannot breathe on their own: the lungs themselves are like passive ‘balloons’, unable to expand and contract on their own. The true drivers of respiration are a group of muscles called respiratory muscles, which move the chest to complete inhalation and exhalation in the lungs.The decline of respiratory muscle function is the core issue: as people age, respiratory muscles gradually lose elasticity and become harder, leading to insufficient chest expansion, […]