30 Respiratory and Circulatory Systems
30 Respiratory and Circulatory Systems
30 Respiratory and Circulatory Systems
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FIGURE <strong>30</strong>.9 Blood Flow in the Heart<br />
The structures of the heart keep oxygen-poor blood<br />
separated from oxygen-rich blood.<br />
BIOLOGY<br />
See how the heart<br />
pumps blood at<br />
ClassZone.com.<br />
Oxygen-poor blood<br />
Oxygen-rich blood<br />
FROM BODY<br />
TO LUNGS<br />
FROM LUNGS<br />
TO BODY<br />
1<br />
2<br />
The right atrium<br />
receives oxygenpoor<br />
blood from the<br />
body <strong>and</strong> pumps it<br />
to the right ventricle.<br />
The right ventricle<br />
pumps oxygen-poor<br />
blood to the lungs.<br />
3<br />
4<br />
The left atrium receives<br />
oxygen-rich blood from<br />
the lungs <strong>and</strong> pumps it<br />
to the left ventricle.<br />
The left ventricle pumps<br />
oxygen-rich blood to all<br />
parts of the body.<br />
NORMAL HUMAN HEART<br />
CRITICAL<br />
VIEWING<br />
If the valves in the right ventricle do not close properly,<br />
where in the body might circulation be affected the most<br />
Chapter <strong>30</strong>: <strong>Respiratory</strong> <strong>and</strong> <strong>Circulatory</strong> <strong>Systems</strong> 919
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