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Biology 9 Online
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 ______________.

charge69:

1. Alveoli 2. Oxygen 3. Carbon Dioxide 4. Oxygenated/O2-rich

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