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The correct answer is e. Blood becomes oxygenated in the lungs through the gas exchange of carbon dioxide and oxygen. It then travels, via the pulmonary circuit, to the heart. The heart distributes this blood to the rest of the body via the systemic circuit. The oxygenated blood is then deoxygenated by the tissues through the gas exchange of oxygen and carbon dioxide. This deoxygenated blood travels to the heart via the systemic circuit. The heart then sends this blood to the lungs, via the pulmonary circuit, where it will cycle back through the same process.
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