Which one of the folowing participate in the body's second line of defense?
A.Tissue liningsof the respiratory system
B. Interferons
C. Skin cells
D. Saliva
http://www.amnh.org/nationalcenter/infection/03_inf/03_inf.html
For virus, B is the choice, as interferons are part of the immune system.
http://www.amnh.org/nationalcenter/infection/03_inf/03_inf.html
For virus, B is the choice, as interferons are part of the immune system.
A, B, and D are all the first line of defense
i meant a,c, and d
To determine which of the options participate in the body's second line of defense, we can look at the provided source for information on the immune response.
According to the source, tissue linings of the respiratory system (option A) are part of the body's first line of defense. They act as physical barriers to prevent the entry of pathogens into the body.
Interferons (option B), on the other hand, are indeed part of the body's second line of defense. Interferons are proteins released by infected cells to alert nearby cells and stimulate the immune system response against viral infections.
Skin cells (option C) are also part of the first line of defense. The skin acts as a physical barrier to prevent the entry of pathogens and protects the underlying tissues.
Saliva (option D) is another component of the first line of defense. Saliva contains enzymes and antibodies that help to break down and neutralize pathogens in the mouth before they can enter the body.
Therefore, the correct answer is B. Interferons participate in the body's second line of defense against pathogens.