diagram given below represent hearts of these different animals observe it and answers the question
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(i) Here, in the image, Atria has started to contract. This contraction phase of Atria is called Atrial systole.
(ii) 1. Pulmonary Artery, 2. Superior vena cava, 3. Aorta
(iii) Upper chambers i.e., both the atria are contracting in this phase because blood is pumped towards the ventricles.
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