This program demonstrates the movements of the gastrointestinal tract normally and under the influence of several drugs: physostigmine, atropine, epinephrine, and magnesium sulfate.
Learn more about this film and search its transcript at NLM Digital Collections: http://resource.nlm.nih.gov/8600257A
Learn more about the National Library of Medicine's historical audiovisuals program at: https://www.nlm.nih.gov/hmd/collections/films