Defecation

Japanese: defecation
Defecation

...There is a large degree of individual variation and it is influenced by the intestinal flora and diet.
[Defecation]
When the rectal wall is stretched by the retention of stool, the urge to defecate is aroused. At the same time, the internal anal sphincter, which is controlled by the parasympathetic nervous system (pelvic nerve), reflexively relaxes.

*Some explanations of terms that mention "defecation" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…個人差が大きく,腸内細菌叢や食事内容によって左右される。
[排便defecation]
 大便の貯留によって直腸壁が伸展されると便意を催す。同時に,副交感神経(骨盤神経)支配の内肛門括約筋は反射的に弛緩する。…

※「defecation」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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