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प्रश्न
Many microbial pathogens enter the gut of humans along with food. What are the preventive barriers to protect the body from such pathogens? What type of immunity do you observe in this case?
उत्तर
- The mucus coating of the epithelium lining of the gut helps in trapping microbes entering the body.
- Saliva in the mouth and hydrochloric acid in gastric juice secreted by stomach prevent microbial growth. This type of immunity is innate immunity.
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संबंधित प्रश्न
Sensitized helper T-cells produce ____________.
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Cellular factors in innate immunity is provided by ______.
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| When a microorganism invades a host, a definite sequence of events usually occurs leading to infection and disease, causing suffering to the host. This process is called pathogenesis. Once a microorganism overcomes the defence system of the host, development of the disease follows a certain sequence of events as shown in the graph. Study the graph given below for the sequence of events leading to the appearance of a disease and answer the questions that follow: |
(a) In which period, according to the graph there are maximum chances of a person transmitting a disease/infection and why? (1)
(b) Study the graph and write what is an incubation period. Name a sexually transmitted disease that can be easily transmitted during this period. Name the specific type of lymphocytes that are attacked by the pathogen of this disease. (2)
OR
(b) Draw a schematic labelled diagram of an antibody. (2)
(c) In which period, the number of immune cells forming antibodies will be the highest in a person suffering from pneumonia? Name the immune cells that produce antibodies. (1)
Give one difference between the following pair:
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