Figure 1. Types of movement across membranes. Molecules can diffuse across a. membrane down a concentration gradient without the aid of a protein or the input of. energy. Passive and active transport require membrane transport proteins. Channel. proteins carry out passive transport, but carrier proteins can carry out passive or active. transport.
Akron, Iowa. Akron is a city in Plymouth County, Iowa, United States. The population was 1,486 at the 2010 census.
It is in the Great Lakes region approximately 39 miles (63 km) south of Lake Erie along the Little Cuyahoga River. As of the 2010 census, the city had a population of 199,110. The Akron, OH Metropolitan Statistical Area (MSA) covers Summit and Portage counties, and in 2010 had a population of 703,200. Akron is also part of the larger Cleveland-Akron-Canton, OH Combined Statistical Area, which in 2010 had a population of 3,515,646.