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2
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these prevent back flow
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4
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this carries the oxygenated blood from the lungs back to the left atrium of the heart.
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5
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this increases when you exercise.
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6
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these are 1 cell thick.
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7
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red blood cells contain this protein.
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8
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blood enters the heart through a vein and collects here.
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9
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these carry blood away from the heart.
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1
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this separates the right and left side of the heart.
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3
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these carry blood to the heart.
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4
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this is a very important part of the heart.
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