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.
How does the structure of arteries and veins relate to their functions? Arteries - transports oxygenated blood from the heart (except in pulmonary artery which contains deoxygenated blood). Arteries have: -thick muscular wall. -much elastic tissue. -small lumen relative to diameter. -not permeable. -valves in pulmonary artery and Aorta only. -blood under high pressure (10-16kPa)