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Bio07_TR__U10_CH37.QXD 5/9/06 1:40 PM Page 99 Name______________________________ Class __________________ Date ______________ The Human Heart The human heart has four chambers: right atrium, right ventricle, left atrium, and left ventricle. Blood flows from the body into the right atrium. Valves keep blood flowing in only one direction. Follow the prompts to identify parts of the human heart. The diagram shows the heart as if viewed from the front, so left and right are switched. • Color the left atrium orange. • Color the left ventricle red. • Color the right atrium yellow. • Color the right ventricle blue. to body from upper body from lungs Use the diagram to answer the question. 1. A valve is located between the right atrium and the right ventricle. What is the role of valves in the heart? © Pearson Education, Inc., publishing as Pearson Prentice Hall. 99 Bio07_TR__U10_CH37.QXD 5/9/06 1:40 PM Page 100 Name______________________________ Class __________________ Date ______________ The Circulatory System The human circulatory system moves blood through two primary pathways. One connects the heart and lungs, and the other connects the heart and the rest of the body. Draw arrows to show how blood moves through the circulatory system. One has been drawn for you. Capillaries of head and arms Superior vena cava Capillaries of right lung Aorta Pulmonary artery Pulmonary vein Capillaries of left lung Inferior vena cava Capillaries of abdominal organs and legs Use the diagram to answer the question. 1. Through which blood vessel does blood return to the heart from the head and arms? © Pearson Education, Inc., publishing as Pearson Prentice Hall. 100 Bio07_TR__U10_CH37.QXD 5/9/06 1:40 PM Page 101 Name______________________________ Class __________________ Date ______________ Blood Vessels As blood flows through the body, it passes through three types of blood vessels—arteries, veins, and capillaries. Complete the table. Fill in the missing information. Blood Vessels Structure Function arteries thick walls containing connective tissue, endothelium, and smooth muscle walls containing connective tissue, endothelium, and smooth muscle; large ones also have valves to control the direction of blood flow capillaries carry blood toward the heart bring nutrients and oxygen to cells and remove carbon dioxide and waste Use the table to answer the questions. 1. Which are the smallest blood vessels? Circle the correct answer. capillaries veins 2. How does exercise help veins function? © Pearson Education, Inc., publishing as Pearson Prentice Hall. 101