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Circulatory System

Across
Human blood has a lot of
Human blood is ______ and always red
Vein under your skin appear to be ______ or green
Major artery that carries oxygenated blood to the body
Blood enters the heart through the
How many chambers does the heart have
Which blood cells fight off infections
Down
The _______ system is absolutely fascinating
Red blood cells have iron-containing protein called
Carries blood away from the heart
Human heart ______ over 100,000 times a day
Carries blood to the hear