Page 127 - MNU microbiology theoritical 2025
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General Microbiology & Immunology (PM 401) Second level Semester 4 2024/2025
Types of White Blood Cells
There are five different types of White blood cells, and they are classified mainly
based on the presence and absence of granules.
• Granulocytes
They are leukocytes, with the presence of granules in their cytoplasm. The
granulated cells include- eosinophil, basophil, neutrophil
• Agranulocytes
They are leukocytes, with the absence of granules in their cytoplasm.
Agranulocytes are further classified into monocytes and lymphocytes.
Cells of innate immunity
A. Granulocytes
1. Neutrophiles
• Sometimes called polymorphonuclear neutrophilic
leukocytes, polys, names that reflect the appearance of
multiple lobes of their single nucleus.
• They are the most abundant and important granulocytes of
innate responses.
• Neutrophils are the first cells of the immune system to
respond to an invader such as bacteria or a virus.
General Microbiology & Immunology (PM 401) theoretical handbook Page 116
