WhenWe Crossword Puzzles

Circulatory System



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              16                          
                                         
Across Down
3 place where substances are exchanged between the blood and body cells
4 the liquid part of blood
5 take up oxygen in the blood and deliver it to cells elsewhere in the body
6 the body's disease fighters
7 (singular) lower chambers of the heart
8 the process by which molecules move from an area of higher concentration to an area of lower concentration
13 a force exerted by blood against the walls of blood vessels
14 group of heart cells that sends out signals that make the heart muscle contract
15 blood vessels that carry blood away from the heart
16 iron-containing protein that binds chemically to oxygen molecules
1 a flap of tissue that prevents blood from flowing backward
2 blood vessels that carry blood back to the heart
3 consists of the heart, blood vessels, and blood
9 (singular) upper chambers of the heart
10 largest artery in the body
11 the alternating expansion and relaxation of the artery walls
12 hollow, muscular organ that pumps blood throughout the body
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