In its resting state, the neuron is more negative inside compared to outside. The resting membrane potential is -70 millivolts (mV). The reason for this is because of the distribution of charged ions :
The 2014 Portland, Maine, population is 66,235. There are 3,108 people per square mile (population density). The median age is 36.7. The US median is 37.2. 38.53% of people in Portland, Maine, are married. 13.81% are divorced. The average household size is 2.08 people. 27.60% of people are married, with children. 19.64% have children, but are single.
A file photo of Portland. Portland is moving on up. The city is now the 26th largest in the country, according new estimates released by the U. S. Census Bureau Wednesday night. Between July 2014 and July 2015, Portland's population increased 1.9 percent, or by 11,889 people, enough to rise two positions in the national population estimate rankings.