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21. Spleen:
A. A specialized lymphoid tissue
B. Filters blood and kills blood-borne pathogens
C. It is a primary immune organ
D. A and B
E. B and C

22. The first line of defense system:
A. Cleaning of antigens by fluids, mucus, and cilia
B. Phagocytosis
C. Inflammation
D. Interferon reactions
E. A and D

23. Interferons:
A. Are cytokines
B. Non-specifically kill virally infected cells
C. Involved in specific immune responses
D. All of the above
E. None of the above



Answer :

GinnyAnswer

Final answer:

The spleen serves as a specialized lymphoid tissue that filters blood and eliminates pathogens. The first line of defense system involves various mechanisms including antigen cleaning and interferon reactions. Interferons, as cytokines, can non-specifically eliminate virally infected cells.


Explanation:

Spleen:

  • A. a specialized lymphoid tissue
  • B. filters blood and kills blood-borne pathogens

The spleen functions as both a specialized lymphoid tissue and a crucial organ that filters blood by removing pathogens and damaged blood cells. This makes options A and B correct.

The first line of defense system:

  • A. cleaning of antigens by fluids, mucus, and cilia
  • D. interferon reactions

The first line of defense system involves mechanisms like cleaning antigens and interferon reactions, supporting options A and D.

Interferons:

  • A. are cytokines
  • B. non-specifically kills virally infected cells

Interferons are cytokines and can kill virally infected cells nonspecifically, leading to option D, All of the above being correct.


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