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The Circulatory System

Across
Thick, muscular walls that carry blood away from the heart to the other parts of the body.
The upper chambers of the heart
Smallest of the blood vessels
A gas that our cells need for survival
Down
Blood vessels that carry blood and carbon dioxide back to the heart
The lower chambers of the heart
The main organ of the circulatory system
Allow blood to flow in one direction
The main artery
These organs clean the blood of solid waste.