Explanation:
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The human heart has four chambers, which are the left and right atria and the left and right ventricles. Blood enters the right atrium where it then passes through the right ventricle.
The Controlled Substances Act (CSA) Title II of the Comprehensive Drug Abuse Prevention and Control Act of 1970 is the federal U.S. drug policy under which the manufacture, importation, possession, use and distribution of certain narcotics, stimulants, depressants, hallucinogens, anabolic steroids and other chemicals.
Location is a external influence on physical activity