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4. What is the name of the circuit that connects the heart and lungs?
5. What is the name of the circuit that connects the heart to all parts of the body except the lungs?
6. The blood on the right side in Model 1 only contains 50% oxygen, but it has 95% total gases.
a. What gas other than oxygen do you think might be dissolved in the blood on the right side of the
heart?
b. What happens to this gas before the blood enters the left side of the heart?