Circulatory and Immune Systems Question
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What is the first step in the path of blood flow?
- Blood moves into the left ventricle.
- Blood returns from the lungs and enters the left atrium.
- Blood goes out the pulmonary arteries and heads to the lungs.
- Blood moves into the right ventricle.
- Deoxygenated blood enters the right atrium through the vena cava.