defence mechanisms of respiratory system

Defence mechanisms of respiratory system. 5 natural defenses.

Defence mechanisms of respiratory system. The average one that is moderately active throughout the daytime breathes regarding twenty,000 liters (more than 5,000 gallons) of air every twenty-four hours. Inevitably, this air (which would weigh over 20 kilograms [44 pounds]) contains probably harmful particles and gases. Particles, like dirt and soot, mold, fungi, bacteria, and viruses deposit on airway and alveolar surfaces. Fortunately, the system has defense mechanisms to wash and shield itself. solely extraordinarily little particles, under three to five microns (0.000118 to 0.000196 inches) in diameter, penetrate to the deep lungs.

Lungs play a great role in the defense Mechanism. It has a big role in the immunological defense system of the body. It has its defense mechanisms. Lungs protect themselves from bacteria and viruses by themselves and with the help of other various types of cells present in the mucous membrane lining of alveoli. These cells are as follows:

  1. Leukocytes
  2. Macrophages
  3. Mast cells
  4. Natural killer cells
  5. Dendritic cells

Defence mechanisms of respiratory system:

Epithelial cells lining the air passage secret some innate immune factors called defensins and cathelicidins. These substances are the antimicrobial proteins that play an important role in the lung’s natural defenses.

Defence mechanisms of respiratory system
Defence mechanisms of respiratory system

Defense through leukocytes:

Defence mechanisms of respiratory system. White blood cells, a cellular part of the blood that lacks hemoglobin, has a nucleus, is motile, and protects the body against infection and disease by ingesting foreign matter and cell debris, and by destroying infectious agents and cancer cells or producing cells Antibody. leukocytes particularly the neutrophils and the lymphocytes present in the alveoli of lungs provide defense against bacteria and viruses. Neutrophils kill bacteria by engulfing and lymphocytes develop immunity against bacteria.

Defense through macrophages:

Defence mechanisms of respiratory system. A type of white blood corpuscle on the surface of alveoli is another defense for the lungs. thanks to the necessities of gas exchange, alveoli aren’t protected by secretion and cilia—mucus is just too thick and would slow movement of atomic number 8 and carbon dioxide. Instead, alveolar macrophages hunt down deposited particles, bind to them, ingest them, kill any that are living, and digest them. once the lungs are exposed to serious threats, extra white blood cells within the circulation, particularly neutrophils, are recruited to assist ingest and kill pathogens. For example, when the person inhales an excellent deal of dirt or is fighting a metabolism infection, additional macrophages are created and neutrophils are recruited.

Defense through mast cell:

Mast cells are immune cells of the bone marrow lineage and are found in connective tissues throughout the body. The activation and degranulation of mast cells significantly regulate many aspects of physiological and pathological conditions in various environments. Regarding normal physiological functions, mast cells are known. It is used to regulate vasodilation, vascular homeostasis, innate and adaptive immune response, angiogenesis, and detoxification. On the other hand, mast cells are also involved in the pathophysiology of many diseases, including allergies, asthma, allergic reactions, gastrointestinal diseases, many types of malignant tumors, and cardiovascular diseases. This overview summarizes the current understanding of the role of mast cells in many pathophysiological conditions.

Defense through natural killer:

Natural killer cells (NK) are lymphocytes from the same family as T cells and B cells of the same parent. However, as cells of the innate immune system, NK cells are classified as Class I innate lymphocytes (ILC) and can quickly respond to various pathological problems. Signs of cancer. In addition to preventing diseases, the placenta also contains specialized NK cells, which can play an important role during pregnancy.

Usually, NK cells are present in the NGS and other lymphoid organs. Its granules contain hydrolytic enzymes which destroy the microorganisms. NK cells are said to be the that of defense in immunity, especially against viruses.

It destroys viruses and damaged cells which may cause tumors. It also destroys malignant cells and prevents the development of cancerous tumors.

Defense through dendritic cell:

Dendritic cells (DC) are antigen-presenting cells (also known as helper cells) of the mammalian immune system. Their main function is to process antigenic substances and present them on the cell surface to T cells of the immune system. A mediator between the innate and adaptive immune systems.


Defence mechanisms of respiratory system. Lungs are major organs of the body. It can protect itself. Leukocytes, Macrophages, Mast cells, Natural killer cells, Dendritic cells are a natural defender of lungs.

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