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%.
Meanwhile, 23.3 percent of women ages 16 to 64 received welfare in 2011, while that same year 19.2 percent of men ages 16 to 64 received welfare. The percentage of children on welfare has increased dramatically in recent years.