In other words, contraction of radial smooth muscle causes dilation of the pupil. This explains the autonomic actions: 1  Increased release of acetylcholine by the parasympathetic nervous system causes contraction of circular smooth muscle. 2  This makes the pupil (the dark hole) smaller.he pupil is contricted or dilated by the contraction of smooth muscle in the iris. There are two types. One type is arranged in the circle near the pupil. When a circle of muscle contracts, the circle becomes smaller. Thus contraction of the circular muscle causes constriction of the pupil.
forÂ·evÂ·er. adv. 1. For everlasting time; eternally: No one can live forever.2. At all times; incessantly: was forever complaining about the job.. forever-for a very long or seemingly endless time; she took forever to write the paper; we had to wait forever and a day. forever and a day. colloquialism-a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech.
 Live Forever  is a song by English rock band Oasis. Written by Noel Gallagher, the song was released as the third single from their debut album Definitely Maybe (1994) on 8 August 1994, just prior to that album's release.Gallagher wrote the song in 1991, before he joined Oasis.Inspired by The Rolling Stones '  Shine a Light , Live Forever features a basic song structure and lyrics with an optimistic outlook that contrasted with the attitude of the grunge bands popular at the time.ive Forever is in the key of G major (varispeeded up by less than half a semitone during mixing) and is based on a GâDâAm 7 âCâD chord progression, with the G chord becoming an Em during the pre-chorus, though the key changes to A minor following the last chorus.