BASIC FUNCTIONS OF THE CIRCULATORY SYSTEM

Step 4: The . pulmonary arteries. carry blood to the lungs to be oxygenated. Step 5: Oxygenated blood is returned to the heart by . pulmonary veins. Step 6: This oxygenated blood returns to the heart by . pulmonary veins. and enters the . left atrium. Step 7: Blood from the left atrium flows across an open . mitral valve. to enter the . left ... ................
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