Your circulatory system is how your oxygen-rich blood flows from your heart through your body, washing over all your vital organs, then returning oxygen-poor blood to your heart.

The circulatory system, also known as the cardiovascular system, keeps blood pumping and flowing throughout our bodies, delivering important nutrients and oxygen to where they are needed and ...

Some circulatory diseases, such as stroke and heart attacks, need emergency medical attention. Learn more about 11 circulatory diseases here.