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alyciaxleonardo:
Step 4: In the pulmonary circulation, the blood travels through the capillaries of the lungs that surround the _______. During this step the blood absorbs __________ and releases _____________. Now, the blood is considered ______________.
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charge69:
1. Alveoli 2. Oxygen 3. Carbon Dioxide 4. Oxygenated/O2-rich
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