When there is no inflammation, a large number of antigens are cleared from the body and the internal

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It is the immune system that works.

Immune system

The immune system has the role of immune surveillance, defense, and regulation. This system is composed of immune organs (bone marrow, spleen, lymph nodes, tonsils, small intestine collecting lymph nodes, appendix, thymus, etc.), immune cells (lymphocytes, mononuclear phagocytes, neutrophils, basophils, eosinophils, mast cells, platelets (because platelets contain IgG), etc.), and immunoactive substances (antibodies, lysozyme, complement, immunoglobulins, interferon, interleukin, tumor necrosis factor and other cytokines). The immune system is divided into innate immunity (also known as non-specific immunity) and adaptive immunity (also known as specific immunity), of which adaptive immunity is further divided into humoral immunity and cellular immunity.

Basic functions: The immune system is an important system for the body to carry out immune response and immune function. It is composed of immune organs, immune cells and immunoactive substances, and is the most effective defense against pathogen invasion**, which can find and remove foreign bodies, foreign pathogenic microorganisms and other factors that cause fluctuations in the internal environment.

However, its hyperfunction can cause damage to its own organs or tissues.

1.Identification and removal of foreign invading antigens, such as pathogenic microorganisms. This function of preventing the invasion of external pathogens and removing invading pathogens and other harmful substances is called immune defense. Protects the human body from viruses, bacteria, pollutants and diseases.

2.Identify and remove mutated tumor cells, senescent cells, dead cells, or other harmful components from the body. This ability to detect and remove the "non-self" components that appear in the body at any time is called immune surveillance.

Removal of metabolic waste products and the dead and injured bodies of the virus left behind by immune cells in the fight against the virus must be eliminated by immune cells.

3.The environment within the immune system is stabilized through autoimmune tolerance and immunomodulation. Repair immune cells repair damaged organs and tissues, allowing them to return to their original functions.

There is no substitute for a healthy immune system, but it can still be ineffective due to continued intake of unhealthy foods.

a. Free BAI

The epidemic system is not only the body's anti-DDaine system, but also the regulatory system for maintaining homeostasis.

b. The internal environment is the medium through which the cells within the copyright right exchange with the external environment carry out material exchange, B is correct;

c. The regulatory mechanism of internal environment homeostasis is the neuro-humoral and immune regulatory network, which is false;

d. The essence of internal environmental homeostasis is the process of dynamic equilibrium of physical and chemical properties such as osmotic pressure, temperature, and pH in vivo

Therefore, c

a. Antibodies exist in extracellular fluid, which can only destroy extracellular antigens, and A. is wrong;

b. Antibodies resist viruses in a silver state and are specific immunity, and lysosomes can decompose and engulf bacteria, the principles of the two are different, and B is correct;

c. The antigen-antibody complex formed in the source of the internal environment can be engulfed and digested by phagocytes, C is correct;

d. The symptoms of human HIV infection are related to the concentration of the virus and the number of T cells in the body

a. Antibodies belong to secreted proteins, which are mainly distributed in the internal environment, so the specific binding of pathogens and antibodies occurs in the internal environment, a is correct;

b. The human body's ability to maintain the homeostasis of the internal environment has a certain limit, and B is correct;

c. The internal environment can maintain a relatively stable state, so changes in the internal environment will cause corresponding organ and system activities to change accordingly to maintain the relative stability of the internal environment.

d. The decrease in osmotic pressure in the internal environment will lead to a decrease in the secretion of antidiuretic hormone by the hypothalamus