pulmonary system: begins in the right atrium, deoxygenated blood, blood travels to the heart, blood travels to the lungs from the body, travels in a constant flow, has valves throughout , systemic system: begins in the left atrium, oxygenated blood, blood travels from the heart, blood travels from the lungs to the heart, travels with force, has no valves,

circulatory system

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恢復自動保存: ?