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.
The current population of the United States of America is 325,725,566 as of Thursday, January 18, 2018, based on the latest United Nations estimates. the United States population is equivalent to 4.3% of the total world population. the U.S.A. ranks number 3 in the list of countries (and dependencies) by population. The population density in the United States is 35 per Km 2 (92 people per mi 2). The total land area is 9,147,420 Km2 (3,531,837 sq. miles) 83.4 % of the population is urban (270,683,202 people in 2018) The median age in the United States is 37.8 years.