★ Composition of Blood and Blood Cells Quiz
Identify the substance labeled “A” in this vial of blood.
A. Buffy Coat (platelets and WBCs)
B. Formed Elements (RBC)
C. Plasma
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________ is a major component of hemoglobin that carries oxygen to all parts of the body.
A. copper
B. magnesium
C. potassium
D. iron
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