You are playing a new video game that is based on the human immune system.The player is inside a human,and you must successfully fend off invading pathogens in a quest to find the "Golden Antibody." At level 1,your arsenal for fighting off pathogens consists only of the innate immunity leukocytes and their various secretions.If the enemy has killed off most of your neutrophils and macrophages,which of the following should you utilize to recruit more of these leukocytes to the battle?
A)histamine
B)platelets
C)reactive oxygen species
D)cytokines
E)bone marrow

Question

Quizplus · Accepted Answer

Cytokines are signaling molecules that are released by immune cells and play a crucial role in recruitment of other immune cells to the site of infection. They can recruit neutrophils and macrophages to the battle and activate these cells to destroy invading pathogens. Histamine and reactive oxygen species are involved in the immune response, but they do not directly recruit more leukocytes to the battle. Platelets help in blood clotting but are not involved in the immune response. While bone marrow produces leukocytes, it is not a mechanism for recruiting more leukocytes to the site of infection.

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