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The _________system carries oxygen and nutrients to all parts of our bodies?
What is the main organ of our circulatory system?
The heart is about the size of your ________.
What do we call the movement of blood through the heart and around the body?
What do we call the tiny tubes that carry blood AWAY from the heart?
What do we call tiny tubes that RETURN oxygen poor blood back to the heart?
What do we call the smallest blood vessels in our bodies?
The part of the blood that helps you stop bleeding when cut yourself is called _____________.
red blood cells
The part of the blood that carries oxygen is called ___________. (Remember we can't live without our blood-line)
white blood cells
The part of the blood that fights off harmful bacteria and viruses is called _______________.