| 11. | Belgian newspapers said the operation was to repair a malfunctioning heart valve.
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| 12. | The doctor told me all they needed was a donated heart valve.
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| 13. | The company said it had no plans to recall its heart valves.
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| 14. | She said she may need two heart valve operations . _ _ _=
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| 15. | Recently, researchers have begun working to grow heart valves in vitro.
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| 16. | No mere heart valve or hip fracture could keep him down.
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| 17. | A heart valve regulates the flow of blood from the heart.
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| 18. | Natural heart valves become dysfunctional for a variety of pathological causes.
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| 19. | By 1962 his team had developed an extremely successful artificial mitral heart valve.
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| 20. | He underwent a heart valve replacement at a New Delhi hospital last year.
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