Enumerated powers. The enumerated powers are a list of items found in Article I, Section 8 of the U.S. Constitution that set forth the authority of Congress. In summary, Congress may exercise the powers that the Constitution grants it, subject to the individual rights listed in the Bill of Rights.
The average adult has 10-12 pints of blood. Someone needs blood every two seconds in the U.S. 40,000 pints: Amount of donated blood used each day in the U.S. and Canada. Through a process of separating blood into its individual parts, a single unit of blood can help extend the lives of as many as three people.
Severe burn victims can need the platelets from about 20 Blood unit donations during their treatment. The average liver transplant patient needs 40 units of red Blood cells, 30 units of platelets, 20 bags of Cryoprecipitate, and 25 units of fresh frozen plasma. Using modern techniques, one heart surgery uses, on average, the red Blood cells and platelets provided by from six Blood unit donations.