Human Population
Population may be defined as a group of organisms belonging to one species which occupy a given area at a given time.
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Blood Group
Blood group, also known as blood type, is a group of types of blood based on the presence and absence of blood group antigens in the surface (membrane) of the RBCs, and antibodies on the plasma.
Blood
Blood is defined as specialized connective tissue containing homogenous fluid composed of liquid substance known as plasma and the formed elements RBCs , WBCs and the platelets.
Human Circulatory System
All the parts of the body that help in the transportation of various materials in the body, collectively constitute the Circulatory System.