In the adult body, approximately five liters of blood flow

In the adult body, approximately five liters of blood flow, which corresponds to 7% of its weight. It is the cardiovascular or circulatory system, which allows blood to circulate throughout your body, performing the functions: transport (substances, such as oxygen and nutrients); defense of the body against micro-organisms; maintenance of body temperature and water reserve. Your body circulates venous blood (rich in carbon dioxide) and arterial blood (rich in oxygen). Blood is made up of: White Blood Cells (responsible for defending the body against pathogenic microorganisms); Red Blood Cells (carry oxygen from the lungs to the cells, and some carbon dioxide from the cells to the lungs. They contain hemoglobin which gives blood its red color); Plasma (transports all other constituents of blood, as well as nutrients and some gases, such as carbon dioxide) and Platelets (participate in blood clotting, preventing bleeding).
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