Introduction. Beta-blockers, also known as beta-adrenoceptor blocking agents, are medications used to treat conditions such as angina, heart failure and high blood pressure. They decrease the activity of the heart by blocking the action of hormones like adrenaline.
1 The concept of âdemographic changeâ describes a populationâs age structure adjusting to. changes in living conditions. Consequently, changes in thcomposition of a societyâe s age. structure are the result of social shifts. (. 2  cf. . 3  theory of first and second demographic transition.
U.S. Census Bureau PROJECTED TRENDS IN POPULATION SIZE AND GROWTH The total U.S. population is pro-jected to increase by 98.1 mil-lion between 2014 and 2060. As shown in Figure 1, the population is expected to increase from just under 319 million in 2014 to just under 417 million in 2060. This corresponds to an average increase