What components are included in blood?

• A. Red cells and plasma only
• B. Red cells, white cells, and platelets
• C. Platelets and plasma only
• D. White cells and plasma only

Answer: (B)

Blood has two parts: the liquid plasma and the formed elements. The formed elements are red blood cells, white blood cells, and platelets, while plasma is the fluid that carries them and various substances around the body. The option that lists red cells, white cells, and platelets matches the major cellular components of blood. Plasma, though essential, is the fluid portion rather than a cellular component, so it’s not included in that particular listing. The other choices omit one or more of these key cellular elements, making them incomplete.