Zoology - Human Health and Diseases Question with Solution | TestHub
Tears from eyes and interferons are included under which of the following barriers?
Options:
Answer:
Solution:
Innate immunity consists of 4 types of barriers:
I. Physical barriers
- Skin: It is the main barrier that prevents entry of the pathogens.
- Mucus: It covers the epithelium lining of respiratory, gastrointestinal and urogenital tracts so that the microbes may not enter our body.
II. Physiological barriers
These prevent microbial growth and include acid in the stomach, saliva in the mouth and tears.
III. Cellular barriers
Phagocytosis and destruction of microbes by certain types of WBCs and body cells,
A. Neutrophils (Polymorpho-nuclear leucocytes or PMNL), B. Monocytes, C. Natural killer (a type of lymphocytes), D. Tissue macrophages.
IV. Cytokine barriers
Interferons are proteins secreted by the virus-infected cells to protect the spread of infection to healthy or non-infected cells.
