The reason why the human body becomes a unified whole is due to the adjustment of the nervous system. Every zang-fu organ, tissue or organ has its unique physiological function, and these different functions are an integral part of the whole human activity, which determines the unity within the human body.
The exercise system consists of bone, osseointegration and skeletal muscle, which plays the role of exercise, support and protection under the control of the nervous system.
The digestive system consists of digestive tubes and digestive glands. Its basic function is to ingest food, undergo physical and chemical digestion, be absorbed by epithelial cells of digestive tract mucosa, and finally excrete food residues into feces.
The respiratory system consists of respiratory tract and lungs. Due to the needs of life activities, the body regularly exchanges gas with the outside world through the respiratory organs for life, so as to obtain the oxygen necessary for life activities, and at the same time excrete the carbon dioxide produced in the metabolic process in the body. Only in this way can the physiological activities of organs and tissues be carried out smoothly. Therefore, the basic function of the respiratory system is that the body exchanges gas with the outside world, that is, inhaling oxygen and exhaling carbon dioxide.
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