The circulatory system takes the oxygen rich blood from the lungs and the heart pumps that blood through the body so that every bit of our system has the oxygen it needs to function, along with moving white blood cells around to help fight off disease, and nutrients from the digestive system.
The circulatory system also gives a brain-blood barrier necessary to protect the nervous system. The brain controls blood pressure and the heart and therefore is in constant interaction with the circulatory system.
Pulmonary circulation is a loop from the heart to the lungs and back to the heart. It causes the blood to be reoxygenated. From there, it goes through systemic curculation, which pumps the oxygenated blood to the rest of the body. All of your organs need oxygen to function. That is the main function of the circulatory system. Your brain also needs 15% to 20% of your body’s total oxygen supply.
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