1) Which blood vessel carries oxygenated blood out of the left ventricle? a) Pulmonary artery b) Vena cava c) Pulmonary vein d) Aorta 2) Which of these is true? a) The left side of the heart has a thicker wall of muscle because it must pump blood to the lungs b) The right side of the heart has a thicker wall of muscle because it must pump blood to the lungs c) The left side of the heart has a thicker wall of muscle because it must pump blood to the rest of the body d) The right side of the heart has a thicker wall of muscle because it must pump blood to the rest of the body 3) Which type of blood vessel has no valves and thick walls? a) Arteries b) Capillaries c) Vena cava d) Veins 4) What is the job of the valves in the heart? a) To stop blood flowing from the aorta to the left ventricle b) To stop blood flowing back to the lungs c) To stop blood flowing from the ventricles to the atria d) To prevent blood from flowing between the ventricles 5) Which of these structures is the largest? a) White blood cell b) Platelet c) Protein d) Red blood cell 6) How thick are the walls of capillaries? a) They are thicker than walls of veins, but not as thick as those of arteries b) 1-2nm c) Capillaries don't have walls d) One cell thick 7) Why are capillary walls this thick? a) To maximise the rate of diffusion b) To stop white blood cells from leaving c) To increase the rate of respiration d) To prevent infection 8) What is a double circulatory system? a) Where an animal has two hearts b) Where one side of the heart is thicker than the other c) Where the heart has both atria as well as ventricles d) Where one transport system carries blood to and from the lungs and another serves the rest of the body 9) Why is a double circulatory system necessary in humans? a) It allows humans to control the rate of blood flow to different parts of the body b) Humans are warm-blooded and active, so need an efficient circulatory system c) It helps to maximise the rate of gas exchange by providing a large surface area d) Because the heart is a muscle and it needs its own blood supply 10) What links arteries to veins (in organs and organ systems, e.g. the lungs or the digestive system) a) Valves b) A network of capillaries c) The coronary artery and vein d) Blood plasma

The Heart and Circulation

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