ICSE Class X Biology 2013 Solved Papers
Show Para
The diagram given below represents the human heart in one phase of its functional activities. Study the same and answer the questions that follow :
© examsiri.com
Question : 68 of 90
Marks:
+1,
-0
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).
© examsiri.com
Go to Question: