The muscular system. The muscular system is composed of specialized cells called muscle fibers. Their predominant function is contractibility. Muscles, attached to bones or internal organs and blood vessels, are responsible for movement. Nearly all movement in the body is the result of muscle contraction. Exceptions to this are the action of cilia, the flagellum on sperm cells, and amoeboid movement of some white blood cells. The muscular system in vertebrates consists of three different types of muscles: cardiac, skeletal and smooth.
Welfare Statistics by Race, State and Payment. There are approximately 12.8 million Americans on welfare, accounting for 4.1% of the US population. An estimated $131.9 billion is spent by the government on welfare each year. The following percentages are recipients of welfare based on race. â¢ White â 38.8%.
But many seem perfectly willing to give up that independence for security. By this measure, according to the report, 23.1 percent of Americans were recipients of welfare in 2011. Since 1993, the earliest year covered by the report, that is the highest percentage of Americans reported to be receiving welfare. A startling 38 percent of all children 5 and under in the United States were welfare recipients in 2011, according to the report.