1 adj Social means relating to society or to the way society is organized. ADJ n. ...the worst effects of unemployment, low pay and other social problems., ...long-term social change., ...changing social attitudes., ...the tightly woven social fabric of small towns., ...research into housing and social policy.
The human circulatory system (simplified). Red indicates oxygenated blood carried in arteries, blue indicates deoxygenated blood carried in veins. Capillaries, which join the arteries and veins, and the lymphatic vessels are not shown.
The parts of the cardiovascular system include the heart, which is the organ that pumps the blood, and a network of blood vessels: Arteries: The blood vessels that take blood away from the heart. Veins: Blood vessels that return blood to the heart.