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: The muscularis is responsible for segmental contractions and peristaltic movement in the GI tract. The muscularis is composed of two layers of muscle: an inner circular and outer longitudinal layer of smooth muscle.
In the large intestine, peristalsis occurs once every 30 minutes. A strong, sustained wave of peristalsis occurs in the colon two or three times a day (usually after a meal), which forces the waste material into the last part of the large intestine (the rectum) and prompts the urge to poop.