Weight management

How many components are there in the human body?

The basic unit of the human body is the cell, which can be divided into head, neck, trunk, and limbs according to the shape of the human body. According to the system, the human body is composed of several major systems such as the motor system, digestive system, respiratory system, urinary system, reproductive system, circulatory system, immune system, nervous system, and endocrine system. Under the dominance and regulation of the nervous system, each system divides and cooperates to realize various complex life activities, making the human body a complete and unified organism.

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1. Motion system: It is composed of bone, bone connections and skeletal muscles. Adults have a total of 206 bones, which are divided into skull, trunk bone, and limb bone, accounting for about 60% -70% of adult body weight. It constitutes the basic outline of the human body and plays a role in movement, support and protection for the human body;

2. Digestive system: It is composed of digestive tract and digestive glands, including stomach, intestines, liver, pancreas and other organs. It is mainly used for digesting food, absorbing nutrients and excreting metabolites;

3. Respiratory system: It is composed of extrapulmonary respiratory tract and lungs. The extrapulmonary respiratory tract includes the nose, pharynx, laryngeal trachea and main bronchi. It mainly performs gas exchange functions, inhaling oxygen and excreting carbon dioxide.

4. Urinary system: composed of kidney, ureter, bladder and urethra. Its main function is to synthesize urine and excrete it. Its main function is to excrete water-soluble metabolites in the body, such as urea, uric acid, etc. 5. Reproductive system: including internal and external genitalia, of which the internal genitalia is composed of gonads, reproductive ducts and accessory glands. The external genitalia are mainly male and female organs, such as the penis, vagina, etc., which mainly have the function of reproduction and the formation and maintenance of secondary sexual characteristics;

6. Circulatory system: mainly composed of the extracellular fluid of the organism, such as plasma, lymphatic, tissue fluid, etc., and the pipes through which the circulation flows. The circulatory system is the transportation system in the body, mainly transporting nutrients and oxygen, and can also transport heat to various parts of the body to maintain body temperature, and transport hormones to target cells to regulate their functions;

7. Immune system: It is composed of immune organs, such as bone marrow, thymus, spleen, etc., immune cells such as lymphocytes, core solo phagocytes, neutrophils, etc., as well as immune molecules, such as antibodies, immunoglobulins, interferons, etc., mainly used to resist pathogenic bacteria invasion;

8. Nervous system: It is mainly composed of nervous tissue, which is composed of nerve cells and glial cells. It mainly regulates the coordination of the activities of various systems and organs in the human body, and coordinates the activities of organs in various systems of the whole body.

9 Endocrine system: It is another important regulatory system other than the nervous system, composed of endocrine glands and endocrine tissues. Hormones secreted by the endocrine system play an important role in the body’s metabolic growth and development, reproductive function and maintaining the stability of the body’s environment.

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