This is a relaxation of the smooth muscles in the internal anal sphincter. The first happens automatically, and a person cannot control it. The rectumĪs the digested food moves into the rectum, nerves in the wall of the rectum known as stretch receptors detect when the chamber is full and stimulate the desire to defecate.ĭefecation involves two types of muscle movement. Next, peristalsis moves the feces toward the rectum.
0 Comments
Leave a Reply. |