Explain coronary, pulmonary, and systematic circulation and the differences between them.

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Mammals, including humans, have a double circulatory system. This double circuit system is comprised of the pulmonary system and the systemic system. Together this double system transports five to six gallons of blood around the body every minute. This is the equivalent of 2,000 gallons of blood being circulated throughout the body over the course of a day. This keeps the body healthy.

The blood vessels of the pulmonary system transport blood only between the heart and lungs. This circuit sends deoxygenated blood to the lungs to absorb oxygen and transfer carbon dioxide to be exhaled out of the body by the respiratory system. The freshly oxygenated blood is sent back to the heart, where it is then circulated to the rest of the body.

The systemic system is the circuit that transports the oxygenated blood to the rest of the body's tissues and organs. The blood delivers oxygen to the body's cells and receives carbon dioxide from these cells. The blood then begins its return trip to the heart to repeat the process all over again.

The pulmonary and systemic circulatory systems are an efficient way to keep the body supplied with oxygen and nutrients and remove waste products like carbon dioxide from the body's tissues.

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