व्हिच पार्ट ऑफ द हार्ट इज कॉन्ट्रैक्ट इन इन्वेंटरी क्यूरोसिस टो गिव रीजन टो सपोर्ट योर आंसर
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Explanation:
Heart is the organ for pumping oxygenate blood through out the body by rhythmic contraction of cardian muscles. Atria is the contracting part of the heart, these are the chamber where blood enter the heart and these undergoes atrial systole. Contractiin of the atria eject blood through the valves and into the ventricles.
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