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Answer: c. Blood is composed of the formed elements and plasma. Plasma is the liquid portion of blood. The formed elements consist of the cells and cell fragments. The erythrocytes (red blood cells), platelets, and leukocytes (white blood cells) are all considered formed elements.eutrophil. d. Monocytes. e. Eosinophils. Answer: b. Basophils are the least abundant leukocyte. Leukocytes are the white blood cells. The order of frequency of the leukocytes is: neutrophil, lymphocyte, monocyte, eosinophil, basophil.
These blood cells (which are also called corpuscles or formed elements) consist of erythrocytes (red blood cells, RBCs), leukocytes (white blood cells), and thrombocytes . By volume, the red blood cells constitute about 45% of whole blood, the plasma about 54.3%, and white cells about 0.7%.