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 of the United States from 1790 to 2015 in residents per square mile of land areaPopulation density of the United States 2015. United States: Population growth from 2005 to 2015 (compared to the previous year)Population growth in the U.S. 2015. Resident population of the U.S. in 2016, by federal states (including the District of Columbia) (in millions)Population in the federal states of the U.S. as of 2016.