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.
Peristalsis is the regular contracting and relaxing of the  digestive tract that keeps food moving throughout the system. It is  controlled by muscles of muscles in the digeâ¦stive system, such as  the ones in the throat, stomach, and intestines.