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<p>and <a href="page.php?w=extracellular_fluid">extracellular fluid</a> (<a href="page.php?w=blood_plasma">plasma</a>) from the body for analysis. Blood flows throughout the body, acting as a medium that provides <a href="page.php?w=oxygen">oxygen</a> and nutrients to tissues and carries waste products back to the excretory systems for disposal. Consequently, the state of the bloodstream affects or is affected by, many medical conditions. For these reasons, blood tests are the most commonly performed <a href="page.php?w=medical_test">medical test</a>s.</p><p>
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