Multiple Choice
Which microorganism is most commonly responsible for community-acquired pneumonia in adults?
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1. Introduction to Microbiology
Introduction to Microbiology
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The two main classes of leukocytes are ______.
A
granulocytes and agranulocytes
B
erythrocytes and thrombocytes
C
macrophages and dendritic cells
D
lymphocytes and monocytes
Verified step by step guidance1
Understand that leukocytes, or white blood cells, are classified based on the presence or absence of granules in their cytoplasm.
Recognize that granulocytes are leukocytes containing visible granules when stained and viewed under a microscope. These include neutrophils, eosinophils, and basophils.
Know that agranulocytes are leukocytes that lack visible granules in their cytoplasm. This group includes lymphocytes and monocytes.
Recall that erythrocytes (red blood cells) and thrombocytes (platelets) are not leukocytes, so they are not part of the leukocyte classification.
Therefore, the two main classes of leukocytes are granulocytes and agranulocytes, based on the presence or absence of cytoplasmic granules.
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