Double circulatory system
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Image:Blood circulation (human).png
The double circulatory system of blood flow refers to the separate systems of pulmonary circulation and the systemic circulation in amphibians, birds and mammals (including humans.) In contrast, fishes have a single circulation system.
For instance, the adult human heart consists of two separated pumps, the right side with the right atrium and ventricle (which pumps deoxygenated blood into the pulmonary circulation), and the left side with the left atrium and ventricle (which pumps oxygenated blood into the systemic circulation). Blood in one circuit has to go through the heart to enter the other circuit.
Blood circulates through the body two to three times every minute. In one day, the blood travels a total of 19,000 km (12,000 miles), or four times the distance across the U.S. from coast to coast.
See also
Throughout the circulatory sytem there are many valves. There are 3 main types. The bicuspid valve which is found near the left ventricle and the aorta. Then there is the tricuspid valve which is found near the right ventricle and the aorta then finally there is the semilunar valve which is found in between the atria and the ventricle
External Links
- Science aid circulation (humans) A simple look at the human circulatory system.
| Circulatory system - edit |
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| Blood → Heart → Aorta → Arteries → Arterioles → Capillaries → Venules → Veins → Vena cava → Heart → Pulmonary arteries → Lungs → Pulmonary veins |