An official website of the United States government
Here’s how you know
Official websites use .gov A
.gov website belongs to an official government
organization in the United States.
Secure .gov websites use HTTPS A
lock (
) or https:// means you’ve safely connected to
the .gov website. Share sensitive information only on official,
secure websites.
As the heart pumps, arteries, shown here in red, carry oxygen-rich blood away from the heart toward the body's tissues and vital organs. These include the brain, liver, kidneys, stomach, and muscles -- even the heart muscle.
At the same time, veins, shown here in blue, carry oxygen-poor blood from the tissues back to the heart. From there, it passes to the lungs to get more oxygen to take back to the heart so the cycle can repeat.
Review Date 7/15/2024
Updated by: Frank D. Brodkey, MD, FCCM, Associate Professor, Section of Pulmonary and Critical Care Medicine, University of Wisconsin School of Medicine and Public Health, Madison, WI. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.
