1) Which organ is responsible for pumping blood throughout the body? a) Lungs b) Heart c) Liver 2) What is the main function of red blood cells? a) Carrying oxygen to the body's cells b) Fighting off infections c) Filtering waste from the blood 3) Which blood vessels carry oxygenated blood away from the heart? a) Arteries b) Veins c) Capillaries 4) Which blood vessels have thin walls that allow for the exchange of oxygen and nutrients with body tissues? a) Arteries b) Veins c) Capillaries 5) What is the purpose of valves in the circulatory system? a) To regulate blood pressure b) To prevent blood from flowing backward c) To produce red blood cells 6) Which component of blood is responsible for clotting to prevent excessive bleeding? a) Red blood cells b) White blood cells c) Platelets 7) Which chamber of the heart pumps oxygenated blood to the rest of the body? a) Left atrium b) Right atrium c) Left ventricle 8) What is the purpose of the respiratory system in relation to the circulatory system? a) To pump blood throughout the body b) To carry oxygen to the body's cells c) To filter waste from the blood 9) What is the largest artery in the human body? a) Aorta b) Pulmonary artery c) Carotid artery 10) What is the purpose of the circulatory system? a) To transport oxygen, nutrients, and hormones throughout the body b) To regulate body temperature c) All of the above

The Circulatory System

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