If the statement is true, write "TRUE." If it is false, change the underlined word or words to make the statement true. Write your answer on the space provided.

10. The human circulatory system consists of the heart, the blood vessels, and the blood.

11. Oxygen-rich blood is pumped by the right of the heart through the lungs.

12. Blood returning to the heart from systemic circulation is laden with carbon dioxide.

13. Valves in the heart ensure that blood moves through the heart in a two-way direction.

14. In the circulatory system, the exchange of nutrients and wastes occurs in the arteries.

15. Red blood cells are produced in the periosteum.
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