Despite this variability, the structure of the heart and major vessels tells us a lot about the evolutionary history of vertebrates and the evolutionary changes that have greatly modified vertebrate ...

Your circulatory or cardiovascular system serves a vital function by delivering oxygen and nutrients to all the organs and tissues of your body. Learn more about how the circulatory system works ...

For more than a century, a patch of cold water south of Greenland has resisted the Atlantic Ocean's overall warming, fueling debate among scientists. A new study identifies the cause as the long ...