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When the pulmonary valve is missing or does not work well, blood does not flow efficiently to the lungs to get enough oxygen.
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Heart present in the thoracic cavity.
If it present in abdominal cavity instead of thoracic cavity then in any accident, the chance of damage will increase because the thoracic region protect the organs in it.
And
A hear can't perform its function well if any of its valve cannot work normally. If valve absent in heart then there be no heart beat at all and blood will not flow through body.
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