ICSE Class X Biology 2013 Solved Papers
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The diagram given below represents the human heart in one phase of its functional activities. Study the same and answer the questions that follow :
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Question : 68
Total: 90
Which part of the heart is contracting in this phase? Give a reason to support your answer.
Solution:
Upper chambers i.e., both the atria are contracting in this phase because blood is flowing downwards (towards the ventricles).
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