Video Transcript
Which of the following is not an
example of a white blood cell, leukocyte? (A) Macrophage, (B) chemokine, (C)
neutrophil, (D) eosinophil, or (E) lymphocyte.
Leukocytes, which are commonly
known as white blood cells, are a key component of the immune system. They circulate in the blood,
targeting and fighting off pathogens to help prevent infection.
There are many different kinds of
leukocytes. As this question is asking us to
discern which of the answer choices is not an example of a type of leukocyte, let’s
briefly discuss each of them and eliminate the incorrect answers.
Macrophages and neutrophils are
leukocytes that engulf pathogens to destroy them. Eosinophils are a kind of
granulocyte, a category of white blood cell characterized by the presence of
granules in their cytoplasm. Lymphocytes are white blood cells
that play various important roles in the immune system as well, such as producing
antibodies. Chemokines are not a type of white
blood cell. Instead, they are a kind of
cytokine. A cytokine is a chemical messenger
used for communication between the cells of the immune system.
As macrophages, neutrophils,
eosinophils, and lymphocytes all are kinds of white blood cells, but chemokines are
not, we have found the correct answer to this question. The option that is not an example
of a white blood cell is (B), chemokine.
