székletképzdés

Székletképződés, also known as defecation or bowel movement, is the final stage of the digestion process in humans and many other animals. It involves the elimination of undigested food material, bacteria, and waste products from the body in the form of feces, or stool. The process begins in the large intestine, where water is absorbed from the remaining indigestible food matter. This solidifies the waste into feces.

As feces accumulate in the rectum, the final section of the large intestine, stretch receptors are stimulated. This triggers the defecation reflex, a complex process involving both voluntary and involuntary muscle actions. The urge to defecate is felt, and the internal anal sphincter, an involuntary muscle, relaxes. The external anal sphincter, a voluntary muscle, can be consciously controlled, allowing individuals to decide when and where to defecate.

During defecation, the abdominal muscles contract, increasing intra-abdominal pressure, and the rectal muscles contract, pushing the feces out through the anus. The frequency and consistency of bowel movements can vary greatly among individuals and are influenced by factors such as diet, hydration, physical activity, and underlying medical conditions. Changes in bowel habits can sometimes be an indicator of health issues.