Respuesta :
Mucous membranes are a part of an innate defense that provides the first line of protection against ingested and inhaled infectious agents.
What is innate immunity?
It is a nonspecific type of defense mechanism which is present by birth. It protects us against all antigens and does not depend on prior contact with microorganisms.
It consists of different types of barriers:
- Physical barriers: Skin and mucous membrane are the main physical barriers that help in preventing the entry of microorganisms and trapping it.
- Physiological barriers: HCL in the stomach, saliva in the mouth, tears from the eyes, etc.
- Cellular barriers: Polymorpho-nuclear leucocytes, monocytes, natural killer cells in the blood, and macrophages in the tissues. They phagocytose and destroy the microbes.
- Cytokine barriers: Cytokines are secreted by the immune cells that protect the non-infected cells from further infection.
Adaptive defense is also called acquired immunity which is pathogen-specific. Humoral immunity produces antigen-specific antibodies and is primarily driven by B cells. Cell-mediated immunity does not depend on antibodies and is primarily driven by mature T cells.
Hence mucous membrane comes under the physical barrier of innate immunity which prevents the entry of microorganisms.
Learn more about innate immunity from the link given below:
https://brainly.com/question/23844621?utm_source=android&utm_medium=share&utm_campaign=question
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