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Name the upper chambers of the heart ....

Name the upper chambers of the heart .

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**Step-by-Step Text Solution:** 1. **Understanding the Heart Structure**: The human heart is a four-chambered organ, which means it consists of four distinct chambers that play different roles in the circulatory system. 2. **Identifying the Chambers**: These four chambers are categorized into two upper chambers and two lower chambers. 3. **Naming the Upper Chambers**: The upper chambers of the heart are called the atria. 4. **Further Division of Atria**: The atria are further divided into two parts: the right atrium and the left atrium. 5. **Conclusion**: Therefore, the upper chambers of the heart are the right atrium and the left atrium. **Final Answer**: The upper chambers of the heart are the right atrium and the left atrium. ---
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Oxygen-rich blood from the lungs comes to the thin-walled upper chamber of the heart on the left. The left upper chamber (A) then relaxes. It then contracts and the blood is allowed to enter the next chamber (B), as it expands. When the muscular left lower chamber of heart contracts the blood is pumped out to the body via aorta. Deoxygenated blood reaches from the body to the upper chamber on the right side of heart (C) and it expands. As this part contracts, the corresponding lower chamber (D) dilates. This transfers the blood to right ventricle, which in turn pumps it to the lungs for oxygenated. What is the correct route of blood in a human?