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Blood and Circulation The sinoatrial node (pacemaker) is located in the A) right atrium. B) left atrium. C) right ventricle. D) left ventricle Veins always A) lead away from the heart. B) lead toward the heart. C) carry deoxygenated blood. D) have thick muscular walls. A. B. C. D. The heart fills with deoxygenated blood on the right side only. on the left side only. on both sides at the same time. at the septum. A. B. C. D. Blood circulating to the toes leaves the heart from the right atrium. left atrium. right ventricle. left ventricle. A. B. C. D. The largest vein in the body is the venule. pulmonary vein. jugular vein. vena cava. A. B. C. D. The largest artery in the body is the carotid. coronary. pulmonary. aorta. A. B. C. D. In which of the following vessels is blood pressure greatest? vein capillary artery arteriole A. B. C. D. Blushing, or red face from exercise, is due to a skin pigment. vasoconstriction. vasodilation. contraction of muscles in the skin A. B. C. D. Which of the following arteries does not take blood to the leg. subclavian iliac femoral tibial A. B. C. D. The function of valves in the human circulatory system is to stimulate the heartbeat. accelerate the flow of blood. prevent the backward flow of blood. serve as a cushion to prevent friction. A. B. C. D. The function of valves in the human circulatory system is to stimulate the heartbeat. accelerate the flow of blood. prevent the backward flow of blood. serve as a cushion to prevent friction. A. B. C. D. Which is the CORRECT flow of blood in the human? right atrium right ventricle pulmonary artery right atrium left atrium pulmonary artery left ventricle pulmonary artery aorta left ventricle left atrium aorta A. B. C. D. During systole of the heartbeat cycle the heart muscle relaxes. the A-V valves open. the semilunar valves close. blood flows into the pulmonary artery. A. B. C. D. The fraction 120/80 is the normal blood pressure of a young child. is an indication of hypertension in a resting adult. indicates a pressure of 120 during systole. is determined by using a sphygmomanometer to measure blood pressure A. B. C. D. Which factor causes the brain to speed up the heartbeat? increase in carbon dioxide in the blood decrease in carbon dioxide in the blood increase in oxygen in the blood decrease in nitrogen in the blood The exchange of materials between the blood and the body cells occurs only through the capillaries because the A. blood is moving too fast in the arteries and veins. B. concentration of materials in the veins and arteries is too low. C. walls of the veins and arteries are too thick. D. blood pressure in the veins and arteries is too high. A. B. C. D. The heartbeat is controlled by which portion of the brain? cerebrum pons thalamus medulla A. B. C. D. A person with blood type B can only receive blood from certain people. Who are they? B only B and O O only A, O, B, AB A. B. C. D. What are the parts of blood mainly concerned with clotting? red blood cells platelets plasma white blood cells A. B. C. D. Which of the following is/are true of red blood cells? They are similar to donuts in shape. They are formed in bone marrow. They can squeeze between spaces in capillary walls. Both A) and B) are true. A. B. C. D. Blood in the pulmonary vein differs from that in most other veins in that it is more highly oxygenated. it is at lower pressure. it does not flow toward the heart. it has a higher concentration of nutrients. . A. B. C. D. Which part of the blood is correctly paired with its function? platelets – produce antibodies white blood cells – carry oxygen red blood cells – fight infection plasma – transports wastes and hormones