5. Sodium-potassium pump: Protein mechanism found along the neuron membrane which transports 3 Na+ ions outside of the cell while also drawing 2 K+ ions into the cell; this is an active transport mechanism (requires energy (ATP) to function). 6.
What Is the Population Density of the United States? The population density of the United States is approximately 87.4 people per square mile, according to the 2010 U.S. Census. What Is the Most Densely Populated Continent? Perhaps not surprisingly, the most densely populated continent is Asia. Here are the population densities of the continents: 1  North America - 32 people per square mile. 2  South America - 73 people per square mile. 3  Europe - 134 people per square mile. 4  Asia - 203 people per square mile. 5  Africa - 65 people per square mile. 6  Australia - 6.4 people per square mile.
Population density in the U.S. by federal states including the District of Columbia in 2016Population density in the U.S., by state 2016. Number of cities, towns and villages (incorporated places) in the United States in 2015, by population sizeNumber of U.S. cities, towns, villages by population size 2015. Population of the largest metropolitan areas in the U.S. as of 2015 (in 1,000)Population of metropolitan areas in the U.S. 2015.