Question

which cells make up the white blood cells (wbcs) in the bloodstream?
platelet, lymphocyte, neutrophil, eosinophil, basophil
monocyte, lymphocyte, neutrophil, eosinophil, basophil, erythrocyte
monocyte, leukocyte, neutrophil, eosinophil, thrombocyte
monocyte, lymphocyte, neutrophil, eosinophil, basophil

Explanation:

White - blood cells (WBCs) include monocytes, lymphocytes, neutrophils, eosinophils, and basophils. Platelets are thrombocytes and not WBCs. Erythrocytes are red - blood cells. Leukocyte is another name for WBC but including it in a list of types of WBCs is redundant.

Answer:

Monocyte, lymphocyte, neutrophil, eosinophil, basophil