Section 1

The Circulatory System

• The human circulatory system is made up of the cardiovascular system and the lymphatic system.

• The heart is a muscular organ that pumps blood through an intricate network of blood vessels.

• Blood flows from the body into the heart, which then pumps blood to the lungs. After oxygenation, blood returns to the heart, which pumps blood to the rest of

• Arteries carry blood away from the heart. Materials are exchanged at the capillaries. Veins contain valves and carry blood back to the heart.

• In pulmonary circulation, blood travels between the heart and lungs. In systemic circulation, blood travels between the heart and all other body tissues.

• The lymphatic system returns lymph, fluid that has collected in the tissues, to the bloodstream.

Vocabulary cardiovascular system (p. 933) lymphatic system (p. 933) atrium (p. 933) ventricle (p. 933) valve (p. 934)

aorta (p. 935) sinoatrial node (p. 935) atrioventricular node (p. 935) pulse (p. 935) artery (p. 936)

blood pressure (p. 936) hypertension (p. 936) capillary (p. 936) vein (p. 937)

pulmonary circulation (p. 937)

systemic circulation (p. 937) atherosclerosis (p. 938) lymph (p. 939)

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