★ Composition of Blood and Blood Cells Quiz
This is a blood smear. What type of cell is indicated by the YELLOW arrow?
A. erythrocyte (RBC)
B. megakaryocyte
C. leukocyte (WBC)
D. thrombocyte (platelet)
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Erythrocytes contain the protein ______ that carries oxygen.
A. hemoglobin
B. melanin
C. keratin
D. collagen
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