Most small-molecule neurotransmitters are stored in small vesicles that range from 40 to 60 nm in diameter and, in electron micrographs, appear to have clear centers. The vesicles that store neuropeptides are larger, ranging from 90 to 250 nm in diameter.
The world's largest concentration of natural sandstone arches. 1  Hike the 1.5 mile trail leading to the base of Delicate Arch to experience one of the most breathtaking vistas in the world. 2  Your family will love the short trails in the Windows Section that lead right up to several massive arches.
(name). (email). To: (email). The Gateway Arch, 630 feet tall and another 630 feet wide, is an elegant frame to the historic city of St. Louis. A gigantic endeavor in its time, the arch is almost 100 feet taller than the Washington Monument and more than twice the height of the Statue of Liberty.