heart gifts by teresa update leaves fans stunned - Away State Journal
Heart, organ that serves as a pump to circulate the blood. It may be as simple as a straight tube, as in spiders and annelid worms, or as complex as the four-chambered double pump that is the center of the circulatory system in humans, other mammals, and birds.
Your heart is the main organ of your cardiovascular system, a network of blood vessels that pumps blood throughout your body.
This image shows the four chambers of the heart and the direction that blood flows through the heart. Oxygen-poor blood, shown in blue-purple, flows into the heart and is pumped out to the lungs.
How the Heart Works - What the Heart Looks Like | NHLBI, NIH
Learn about the anatomy of the heart and how its chambers, valves, and vessels work together to maintain effective blood circulation throughout the body to sustain life.
Learn more about the American Heart Association's efforts to reduce death caused by heart disease and stroke. Also learn about cardiovascular conditions, ECC and CPR, donating, heart disease information for healthcare professionals, caregivers, and educators and healthy living.
American Heart Association | To be a relentless force for a world of ...
Here, learn about the structure of the heart, what each part does, and how it works to support the body. We also explore the electrical impulses and the role of CPR.
The heart: Anatomy, how it works, and more - Medical News Today
