Page 254 - Ultimate Visual Dictionary (DK)

THE HUMAN BODY

Circulatory ARTERIAL SYSTEM OF BRAIN

system Left internal
carotid artery

Basilar
THE CIRCULATORY SYSTEM consists of the heart and artery
blood vessels, which together maintain a continuous
Posterior
flow of blood around the body. The heart pumps cerebral
oxygen-rich blood from the lungs to all parts of the artery
body through a network of tubes called arteries, and
Left
smaller branches called arterioles. Blood returns to the heart via vertebral
small vessels called venules, which lead in turn into larger tubes artery
called veins. Arterioles and venules are linked by a network of
tiny vessels called capillaries, where the exchange of oxygen
and carbon dioxide between blood and body cells takes place.
Blood has four main components: red blood cells, white CIRCULATORY SYSTEM OF HEART AND LUNGS
blood cells, platelets, and liquid plasma.
Superior vena cava Aorta
CIRCULATORY SYSTEM OF LIVER
Inferior vena cava

Portal vein

Common
bile duct

Hepatic
artery Gallbladder

Right ventricle Left ventricle
SECTION OF MAIN ARTERY SECTION OF MAIN VEIN
Collagen and elastic fibers Tunica media Collagen and elastic fibers
Tunica Tunica Tunica
media External elastic lamina adventitia External elastic lamina adventitia
Valve cusp

Internal Internal
elastic lamina Tunica intima elastic lamina Tunica intima
Endothelium Arteriole Endothelium

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