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Once upon a time... Life - The heart (1 of 3)

Once upon a time... Life - The heart (2 of 3)

Once upon a time... Life - The heart (3 of 3)

British Heart Foundation - How does a healthy heart work?

Once upon a time... Life - The blood (1 of 3)

Once upon a time... Life - The blood (2 of 3)

Once upon a time... Life - The blood (3 of 3)

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