What are the two classifications of leukocytes?

What are the two classifications of leukocytes?

• A. Lymphocytes
• B. Monocytes
• C. Platelets and erythrocytes
• D. Granulocytes and agranulocytes

Answer: (D)

Leukocytes are grouped by whether their cytoplasm contains obvious granules. Those with visible granules are granulocytes, while those without (or with no obvious granules) are agranulocytes. Granulocytes include neutrophils, eosinophils, and basophils. Agranulocytes include lymphocytes and monocytes. This division reflects both how they look under a microscope and their roles in immunity, with granulocytes often acting as rapid responders through granule contents and agranulocytes handling more specific or ongoing immune tasks. Platelets and erythrocytes are not leukocytes, they’re separate cell types.

Leukocytes are grouped by whether their cytoplasm contains obvious granules. Those with visible granules are granulocytes, while those without (or with no obvious granules) are agranulocytes. Granulocytes include neutrophils, eosinophils, and basophils. Agranulocytes include lymphocytes and monocytes. This division reflects both how they look under a microscope and their roles in immunity, with granulocytes often acting as rapid responders through granule contents and agranulocytes handling more specific or ongoing immune tasks. Platelets and erythrocytes are not leukocytes, they’re separate cell types.