Sodium and chloride also help to determine the resting potential. Sodium is positive and has a concentration gradient set up to flow INTO the cell, and chloride is negative and has a concentration gradient set up to flow INTO the cell. The resting conductance for these two ions is less than that of potassium, but is not zero. Their story (concentration gradient + electrical gradient) is very similar to that of potassium. These ions together determine the resting potential of the cell.
1 the U.S.A. ranks number 3 in the list of countries by population. 2  The population density in the United States is 35 per Km2 (92 people per mi2). 3  The total land area is 9,155,898 Km2 (3,535,111 sq. miles) 4  82.5 % of the population is urban (268,012,791 people in 2016)  The median age in the United States is 38.1 years.
Here are 17 Most Densely Populated Places on Earth. Area: 59.5 km2 (22.96 sq mi) Population: 1,619,090. Population density: 26,939/km2 (69,771/sq mi) Because Manhattan has so many office buildings, it swells to about 3.94 million during the day, giving a population density of about 171,000 per square mile / 66,000 per square km.