Download App

Human Health and Disease — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYHuman Health and Disease5 Marks
Question
Discuss the different barrier of innate immunity.
✓

Answer

It is accomplished by providing different types of barriers:
  1. Physical barriers: These barriers do not allow pathogens and foreign agents to enter the body, e.g., skin, mucous membranes of digestive, respiratory and urinogenital tracts trapping microorganisms.
  2. Physiological barriers: Sweat, tears, acid in the stomach and saliva prevent microbial growth.
  3. Cellular barriers: WBCs (polymorphonuclear leukocytes and monocytes, natural killer lymphocytes) and macrophages phagocytose and destroy microbes.
  4. Cytokine barriers: Interferons produced by virus-infected cells protect non-infected cells from further viral infection.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "Answer the following questions in detail." from Human Health and Disease→Human Health and Disease — all question types→BIOLOGY STD 12 Science question papers→Maharashtra Board STD 12 Science question papers→Maharashtra Board question paper generator→

Similar questions

“The energy flow in the ecosystem follows the second law of thermodynamics.” Explain.
→
Describe the process of transcription in protein synthesis.
→
Discuss the role of lymphoids in the immune response. Explain the different types of lymphoid organs giving two examples of each type in human.
→
Describe the different methods for treatment of cancer.
→
Answer the following questions:
Draw a schematic labelled diagram of a fertilised embryo sac of an angiosperm.
→
Describe the cross between a homozygous tall, round-seeded pea plant and a dwarf, wrinkled-seeded pea plant. What will be the types of progeny in the F2 generation of this cross and in what proportion will it be? Name and state the law which is explained by this example.
→
Describe in sequence the events that lead to the development of a 3-celled pollen grain from microspore mother cell in angiosperms.
→
Discuss about physiological effects and applications of ethylene.
→
Explain any three preventive measures to control microbial infections.
→
Answer the following questions.
Explain the events taking place at the time of fertilisation of an ovum in a human female.
→