No visible cytoplasmic granules are present in .

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No visible cytoplasmic granules are present in .

A) basophils

B) monocytes

C) eosinophils

D) neutrophils

The correct answer is: B) monocytes.

Explanation:

White blood cells can be divided into granular and agranular. Granular leukocytes (WBC) have granules that contain enzymes in their cytoplasm (the enzymes are used in the immune and inflammatory responses). Agranular leukocytes do not have cytoplasmic granules.

The granular leukocytes are 3: basophils, eosinophils, and neutrophils.

The agranular leukocytes are: monocytes and lymphocytes.

Monocytes are very large cells with the important function of phagocytosis: this makes them capable of eating pathogens and old blood cells. When arriving at a tissue outside of the blood, they differentiate to macrophages with special features to perform in that tissue. They make up 2 to 8 percent of all leukocytes. Monocytes and macrophages are also antigen-presenting cells (APCs): when needed, they can present antigens to other white blood cells in order to mediate the immune response.

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