The three types of blood vessels are arteries, veins and ______.
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atrium
-
ventricle
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capillaries
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valves
C
Correct answer
Explanation
The three types of blood vessels in the circulatory system are arteries (carry blood away from heart), veins (carry blood toward heart), and capillaries (tiny vessels where gas/nutrient exchange occurs between blood and tissues). Arteries and veins are transport vessels; capillaries are exchange vessels.