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Rectum - The rectum in human defecation | | Rectum - The rectum in human defecation: Encyclopedia II - Rectum - The rectum in human defecation | | The rectum ampulla acts as a temporary storage facility for feces. As the rectal walls expand due to the materials filling it from within, stretch receptors from the nervous system located in the rectal walls stimulate the desire to defecate. If the urge is not acted upon, the material in the rectum is often returned to the colon where more water is absorbed. If defecation is delayed for a prolonged period constipation and hardened feces results.
When the rectum is full the increase in intrarectal pressure forces the walls of the anal ...
See also:Rectum, Rectum - Medical procedures, Rectum - The rectum in human defecation, Rectum - Sexual stimuli | | | Rectum, Rectum - Medical procedures, Rectum - Sexual stimuli, Rectum - The rectum in human defecation, Gastrointestinal tract, Conical section, (semi-)Latus rectum | | |
| | | Rectum: Encyclopedia II - Rectum - The rectum in human defecation
Rectum - The rectum in human defecation
The rectum ampulla acts as a temporary storage facility for feces. As the rectal walls expand due to the materials filling it from within, stretch receptors from the nervous system located in the rectal walls stimulate the desire to defecate. If the urge is not acted upon, the material in the rectum is often returned to the colon where more water is absorbed. If defecation is delayed for a prolonged period constipation and hardened feces results.
When the rectum is full the increase in intrarectal pressure forces the walls of the anal canal apart allowing the fecal matter to enter the canal. The rectum shortens as material is forced into the anal canal and peristaltic waves propel the feces out of the rectum. The internal and external sphincter allow the feces to be passed by muscles pulling the anus up over the exiting feces.
Other related archivesAbdomen, Adam's apple, Ankle, Anus, Arm, Belly button, Body temperature, Breast, Buttock, Calf, Cheek, Chest, Chin, Clitoris, Conical section, Digestive system, Ear, Elbow, Eye, Face, Finger, Foot, Forehead, Gastrointestinal tract, HEAD, Hair, Hand, Heel, Hip, Human anatomy, Jaw, Knee, LIMBS, Lap, Latin verb, Latus rectum, Leg, Mouth, NECK, Nose, Pelvis, Penis, Ribcage, SKIN, Scrotum, Sex organs, Shoulders, Spine, Suppositories, TORSO, Teeth, Thigh, Throat, Thumb, Toe, Tongue, Vagina, Wrist, ailments, anal canal, anal sex, anus, colon, colonoscopy, constipation, defecate, feces, gut, infants, large intestine, mammals, medicine, mercury poisoning, mercury thermometer, modesty, pediatricians, peristaltic waves, privacy, prostate, rectal exam, route of administration, semi-, sexual arousal, sigmoidoscopy, sphincter, stimulation, straight, thermometer, toddler, vagina
 Adapted from the Wikipedia article "The rectum in human defecation", under the G.N U Free Docmentation License. Please also see http://en.wikipedia.org/wiki |
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