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Identify the organ according to the function and choose the answer correctly:
1. 
The diagram shows a human heart. Which number represents valves that prevent the backward flow of blood into the ventricles?
2. 
The diagram above shows the circulatory system. Which of the following has highest concentration of oxygen-rich blood?
3. 
The diagram shows circulation of blood from heart to various parts of the body. Which of the following shows the flow of oxygenated blood from the left ventricle to the various parts of the body?
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