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Blood flows from the right ventricle to the ____ to the left atrium.
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arteries
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Blood travels from your heart to your legs through ____.
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chambers
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Blood travels from your legs to your heart through ____.
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erythrocytes
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The ____ are the two thick-walled lower chambers of the heart.
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leukocytes
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White blood cells, also known as ____, help fight infections.
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lungs
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Blood cells are made in the ____ (spongy tissue) of large bones.
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marrow
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Red blood cells, also known as ____, deliver oxygen.
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veins
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Your heart has four ____ (two atriums and two ventricles).
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ventricles
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