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The diagram given below represents the h...

The diagram given below represents the human heart in one phase of its functional activities. Study the same and answer the questions that follow :

Which part of the heart is contracting in this phase ? Give a reason to support your answer

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Part 5 is pulmonary semilunar valve through which blood passes into pulmonary artery and prevents the backflow of blood into the right ventricle.
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ICSE-SAMPLE PAPER 2015-SECTION-II
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