Topic Brief: When the muscular wall of the ventricle contracts, blood is pushed out of the heart into the Oxygen is absorbed into the bloodstream through tiny air sacs in the lungs called alveoli.
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When the muscular wall of the ventricle contracts, blood is pushed out of the heart into the Oxygen is absorbed into the bloodstream through tiny air sacs in the lungs called alveoli. Blood circulates to carry oxygen from the air we breathe to cells throughout the
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- When the muscular wall of the ventricle contracts, blood is pushed out of the heart into the
- Oxygen is absorbed into the bloodstream through tiny air sacs in the lungs called alveoli.
- Blood circulates to carry oxygen from the air we breathe to cells throughout the
- Does it ring a bell when you hear the terms "right and left atrium", "
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