1 In-text citations in parenthesis, with only the author's last name and page number included (Smith, p. 4). 2  Double-spaced lines, but with no extra line breaks between each citation. 3  Footnotes (superscripted) also used to provide non-essential information.
Muscularis Extema is the layer of the digestive tract wall that is responsible for peristalsis.
1 Esophageal peristalsis results from sequential contraction of circular muscle, which serves to push the ingested food bolus toward the stomach. 2  Esophageal longitudinal muscle may also play a role in peristalsis.n addition, sequential contraction of longitudinal muscle also occurs during peristalsis. This serves to shorten the esophagus and increase the cross-sectional diameter, thereby facilitating bolus transport.