CHAPTER 11: THE CIRCULATORY SYSTEM


3 Answer these questions, using the following words to help you. Aorta Veins Capillaries


Backflow Arteries Oxygen Carbon dioxide


a. Which blood vessels carry blood to the heart? b. Which blood vessels carry blood away from the heart? c. What is the name of the large artery carrying blood away from the heart to the body? d. Which blood vessels have walls measuring just one cell thick? e. What is the job of valves? f. Name the tiny blood vessels that allow dissolved food to pass into and out of body cells.


g. Sarah is playing in a tennis match. She measures her pulse rate before and after the match. i. What does Sarah notice about her pulse rate before and after the match?


ii. Why does this happen? iii. During exercise, what two important substances are carried by the blood to the muscles?


54


UNIT 3: BIOLOGICAL SYSTEMS


BIOLOGICAL WORLD


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