SUMMARY
The human circulatory system is a typical mammalian system. A four-chambered heart pumps blood through vessels organized in a double circulation system consisting of pulmonary and systemic circuits. This system forms an efficient means of recharging the blood with oxygen and transporting that blood to every cell in the mammal's body. Thus, the circulatory system keeps the mammal's trillions of cells alive by transporting oxygen, nutrients, and other materials and removing wastes.

Activity
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