Question

Which of the following is not true about innate immunity
(A) It is present at the time of birth
(B) Includes all the defenses with which an individual is bom
(C) It is specific in nature
(D) Does not depend on prior contact with antigens or microbes​

Answer 1

Answer:

B) Includes all the defenses with which an individual is bom

Answer 2

It is specific in nature is not true about innate immunity.(option - c)

• Innate immunity as the name suggests is "inborn" i.e. present from birth.
• It consists of various barriers and innate immune cells which prevent various pathogens and foreign organisms from entering our body.
• The barriers are common for all foreign particles and infection-causing organisms.
• It cannot recognize or differentiate between different kinds of pathogens, Hence it is non-specific.
• Various kinds of barriers are:-

1. Physical barriers- skin(1st line of Defence), mucus
2. Physiological barriers-tears, saliva, pH
3. Cytokine barriers-Interferons- are released by virus-infected cells to prevent their neighboring normal cells from viral attack.
4. Cellular Barriers-Macrophages, monocytes, WBCs, Natural killer cells.

• It is activated always in the same way, does not depend on prior contact with antigens, and does not have memory, as the acquired immune system has.