All rights reserved. Types of contractions. When we think of a muscle contracting normally, we tend to think of the muscle shortening as it generates force. While it's true that this is a way of muscle contracting, there are many different ways that a muscle can generate force, as seen in Figure 1 below.
New York City is the most-populous city in the United States, with an estimated record high of 8,491,079 residents as of 2014, incorporating more immigration into the city than outmigration since the 2010 United States Census.
However, city officials (and residents) are claiming that there has been an undercount, and that New York City's population is actually around 8.4 million. It seems extremely unlikely that New York City has seen a decrease in population. So the 2009 census estimate is perhaps still the best one to quote.