1) What is the main function of the heart in the circulatory system? a) To digest food b) To control breathing c) To produce hormones d) To pump blood throughout the body 2) Which blood vessels carry oxygen-rich blood away from the heart? a) Veins b) Bronchi c) Arteries d) Capillaries 3) What type of blood vessel connects arteries and veins? a) Aorta b) Lymph nodes c) Capillaries d) Bronchioles 4) Which blood vessels carry oxygen-poor blood back to the heart? a) Capillaries b) Alveoli c) Veins d) Arteries 5) Where does gas exchange occur in the circulatory system? a) In the heart b) In the veins c) In the arteries d) In the capillaries 6) What does blood carry to the body’s cells? a) Carbon dioxide and waste b) Oxygen and nutrients c) Hormones and enzymes d) All of the above 7) Which part of the circulatory system is responsible for pumping blood? a) Lungs b) Heart c) Veins  d) Capillaries 8) Which part of the circulatory system helps prevent blood from flowing backward? a) Capillaries b) Alveoli c) Arteries d) Veins with valves 9) What is the role of blood in the circulatory system? a) To digest food b) To carry oxygen, nutrients, and waste  c) To produce energy d) To control movement

Circulatory System

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