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| Name | Current message text |
|---|---|
| h English (en) | =====Small intestine===== [[File:Blausen 0817 SmallIntestine Anatomy.png|thumb|240px|Illustration of the small intestine]] {{Main|Small intestine|Duodenum|Jejunum|Ileum}} The [[small intestine]] begins at the [[duodenum]] and is a tubular structure, usually between 6 and 7 m long. Its [[mucosal]] area in an adult human is about {{convert|30|m2|abbr=on}}. The combination of the [[circular folds]], the villi, and the microvilli increases the absorptive area of the mucosa about 600-fold, making a total area of about {{Convert|250|sqm|sqft|abbr=on}} for the entire small intestine. Its main function is to absorb the products of digestion (including carbohydrates, proteins, lipids, and vitamins) into the bloodstream. There are three major divisions: # [[Duodenum]]: A short structure (about 20–25 cm long) that receives [[chyme]] from the stomach, together with [[pancreatic juice]] containing [[digestive enzymes]] and [[bile]] from the [[gall bladder]]. The digestive enzymes break down proteins, and bile [[emulsion|emulsifies]] fats into [[micelles]]. The [[duodenum]] contains [[Brunner's glands]] which produce a mucus-rich alkaline secretion containing [[bicarbonate]]. These secretions, in combination with bicarbonate from the pancreas, neutralize the stomach acids contained in the chyme. # [[Jejunum]]: This is the midsection of the small intestine, connecting the duodenum to the ileum. It is about {{Convert|2.5|m|ft|abbr=on}} long and contains the [[circular folds]] also known as plicae circulares and [[intestinal villus|villi]] that increase its surface area. Products of digestion (sugars, amino acids, and fatty acids) are absorbed into the bloodstream here. # [[Ileum]]: The final section of the small intestine. It is about 3 m long, and contains [[intestinal villus|villi]] similar to the jejunum. It absorbs mainly [[vitamin B12]] and [[bile acids]], as well as any other remaining nutrients. |
| h Japanese (ja) | =====小腸===== [[File:Blausen 0817 SmallIntestine Anatomy.png|thumb|240px|小腸のイラスト]] {{Main/ja|Small intestine/ja|Duodenum/ja|Jejunum/ja|Ileum/ja}} [[small intestine/ja|小腸]]は[[duodenum/ja|十二指腸]]から始まり、通常は長さ6～7mの管状構造をしている。成人の人間の[[mucosal/ja|粘膜]]面積はおよそ{{convert|30|m2|abbr=on}}である。[[circular folds/ja|円形のひだ]]、絨毛、微絨毛の組み合わせにより、粘膜の吸収面積は約600倍になり、小腸全体の総面積は約{{convert|250|sqm|sqft|abbr=on}}となる。主な機能は消化産物（炭水化物、タンパク質、脂質、ビタミンなど）を血流に吸収することである。大きく3つに分けられる： # [[Duodenum/ja|十二指腸]]： 胃から[[digestive enzymes/ja|消化酵素]]を含む[[pancreatic juice/ja|膵液]]と[[gall bladder/ja|胆嚢]]からの[[bile/ja|胆汁]]とともに[[chyme/ja|チャイム]]を受け取る短い構造（長さ約20～25 cm）。消化酵素はタンパク質を分解し、胆汁は脂肪を[[emulsion/ja|乳化]]して[[micel/ja|ミセル]]にする。[[duodenum/ja|十二指腸]]には[[Brunner's glands/ja|ブルンナー腺]]があり、[[bicarbonate/ja|重炭酸塩]]を含む粘液に富んだアルカリ性の分泌物を産生する。これらの分泌物は、膵臓からの重炭酸塩と組み合わさって、胃酸を中和する。 # [[Jejunum/ja|空腸]]： 小腸の中間部で、十二指腸と回腸をつなぐ。長さは約{{Convert|2.5|m|ft|abbr=on}}で、表面積を増加させる[[circular folds/ja|円形ひだ]]と[[intestinal villus/ja|毛]]を含む。消化産物（糖、アミノ酸、脂肪酸）はここで血流に吸収される。 # [[Ileum/ja|回腸]]： 小腸の最後の部分。長さは約3mで、空腸と同様の[[intestinal villus|毛]]を含む。主に[[vitamin B12/ja|ビタミンB12]]と[[bile acids/ja|胆汁酸]]、その他残っている栄養素を吸収する。 |