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.
ALERT: The Gateway Arch Ticketing & Visitor Center has relocated to the Old Courthouse at 11 N. 4th Street. The walking distance between the Old Courthouse and the Arch entrance at the NORTH leg is approximately 7.5 blocks (10-15 minutes of average walking time). EACH guest planning to enter the Gateway Arch will be required to have EITHER a Journey to the Top ticket or an Arch Entry-Only ticket to be allowed access to the facility.