defecation

Examples of defecation in the following topics:

• Defecation Reflex

  • Defecation is a combination of voluntary and involuntary processes with enough force to remove waste material from the digestive system.
  • In the adult human, the process of defecation is normally a combination of both voluntary and involuntary processes with enough force to remove waste material from the digestive system.
  • The relaxation of the internal anal sphincter causes a signal to be sent to the brain indicating an urge to defecate.
  • If defecation is delayed for a prolonged period, the fecal matter may harden and autolyze, resulting in constipation.
  • Once the voluntary signal to defecate is sent back from the brain, the final phase begins.

• Gastrointestinal Reflex Pathways

  • In addition, there are three overarching reflexes that control the movement, digestion, and defecation of food and food waste: the enterogastric reflex, the gastrocolic reflex, and the gastroileal reflex.
  • Thus, this reflex is responsible for the urge to defecate following a meal.
  • It works with the gastrocolic reflex to stimulate the urge to defecate.

• Parasympathetic Responses

  • Its roles include stimulation of "rest and digest" activities that occur when the body is at rest, including sexual arousal, salivation, lacrimation (tears), urination, digestion, and defecation.
  • A useful acronym to summarize the functions of the parasympathetic nervous system is SLUDD (salivation, lacrimation, urination, digestion, and defecation).

• Anatomy of the Large Intestine

  • The large intestine absorbs water from remaining indigestible food matter and compacts feces prior to defecation.

• Absorption and Feces Formation in the Large Intestine

  • The large intestine absorbs water from the chyme and stores feces until they can be defecated.

• Chagas Disease (American Trypanosomiasis)

  • The bug then proceeds to defecate on the person, passing Trypanosoma cruzi parasites in its feces in posterior station infection.
  • After they bite and ingest blood, they defecate on the person.

• The Phosphorus Cycle

  • Animals either release phosphorous through urination or defecation, when they die and are broken down by bacteria.

• Muscularis

  • This is generally when one gets the urge to defecate.

• Dietary Fiber

  • Dietary fiber, or sometimes roughage, is the indigestible portion of plant foods having two main components: soluble (prebiotic, viscous) fiber that is readily fermented in the colon into gases and physiologically active byproducts; and insoluble fiber that is metabolically inert, absorbing water as it moves through the digestive system, easing defecation.
  • Insufficient fiber in the diet can complicate defecation.

• Syncope

  • Vasovagal (situational) syncope, one of the most common types, may occur in scary, embarrassing or uneasy situations, or during blood drawing, coughing, urination or defecation.