ICSE Class X Biology 2015 Solved Papers
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The diagram given alongside represents the human heart in one phase of its functions. Study the diagram carefully and answer the questions that follow:
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Question : 89
Total: 98
Which part of the heart is contracting in this phase? Give a reason to support your answer.
Solution:
Ventricle is contracting because both tricuspid and bicuspid valves are closed whereas both pulmonary semi-lunar and Aortic semilunar valves are open to pump the blood out of the two ventricles.
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