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<meta name="robots" content="INDEX,FOLLOW,NOARCHIVE" /><meta name="citation_inbook_title" content="Genes and Disease [Internet]" /><meta name="citation_title" content="The Digestive System" /><meta name="citation_publisher" content="National Center for Biotechnology Information (US)" /><meta name="citation_date" content="1998" /><meta name="citation_author" content="National Center for Biotechnology Information (US)" /><meta name="citation_fulltext_html_url" content="https://www.ncbi.nlm.nih.gov/books/NBK22172/" /><link rel="schema.DC" href="http://purl.org/DC/elements/1.0/" /><meta name="DC.Title" content="The Digestive System" /><meta name="DC.Type" content="Text" /><meta name="DC.Publisher" content="National Center for Biotechnology Information (US)" /><meta name="DC.Contributor" content="National Center for Biotechnology Information (US)" /><meta name="DC.Date" content="1998" /><meta name="DC.Identifier" content="https://www.ncbi.nlm.nih.gov/books/NBK22172/" /><meta name="description" content="Digestion is the process of turning food into fuel for energy, and for maintenance of the body structure. The digestive tract is a series of hollow organs joined in a long, twisting tube from the mouth to the anus. Inside this tube is a lining called the mucosa. In the mouth, stomach, and small intestine, the mucosa contains tiny glands that produce enzymes to help digest food. There are also two solid digestive organs, the liver and the pancreas, which produce enzymes that reach the intestine through small tubes." /><meta name="og:title" content="The Digestive System" /><meta name="og:type" content="book" /><meta name="og:description" content="Digestion is the process of turning food into fuel for energy, and for maintenance of the body structure. The digestive tract is a series of hollow organs joined in a long, twisting tube from the mouth to the anus. Inside this tube is a lining called the mucosa. In the mouth, stomach, and small intestine, the mucosa contains tiny glands that produce enzymes to help digest food. There are also two solid digestive organs, the liver and the pancreas, which produce enzymes that reach the intestine through small tubes." /><meta name="og:url" content="https://www.ncbi.nlm.nih.gov/books/NBK22172/" /><meta name="og:site_name" content="NCBI Bookshelf" /><meta name="og:image" content="https://www.ncbi.nlm.nih.gov/corehtml/pmc/pmcgifs/bookshelf/thumbs/th-gnd-lrg.png" /><meta name="twitter:card" content="summary" /><meta name="twitter:site" content="@ncbibooks" /><meta name="bk-non-canon-loc" content="/books/n/gnd/A25/" /><link rel="canonical" href="https://www.ncbi.nlm.nih.gov/books/NBK22172/" /><link rel="stylesheet" href="/corehtml/pmc/css/figpopup.css" type="text/css" media="screen" /><link rel="stylesheet" href="/corehtml/pmc/css/bookshelf/2.26/css/books.min.css" type="text/css" /><link rel="stylesheet" href="/corehtml/pmc/css/bookshelf/2.26/css/books_print.min.css" type="text/css" media="print" /><style type="text/css">p a.figpopup{display:inline !important} .bk_tt {font-family: monospace} .first-line-outdent .bk_ref {display: inline} .body-content h2, .body-content .h2 {border-bottom: 1px solid #97B0C8} .body-content h2.inline {border-bottom: none} a.page-toc-label , .jig-ncbismoothscroll a {text-decoration:none;border:0 !important} .temp-labeled-list .graphic {display:inline-block !important} .temp-labeled-list img{width:100%}</style><script type="text/javascript" src="/corehtml/pmc/js/jquery.hoverIntent.min.js"> </script><script type="text/javascript" src="/corehtml/pmc/js/common.min.js?_=3.18"> </script><script type="text/javascript" src="/corehtml/pmc/js/large-obj-scrollbars.min.js"> </script><script type="text/javascript">window.name="mainwindow";</script><script type="text/javascript" src="/corehtml/pmc/js/bookshelf/2.26/book-toc.min.js"> </script><script type="text/javascript" src="/corehtml/pmc/js/bookshelf/2.26/books.min.js"> </script><meta name="book-collection" content="NONE" />
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<div class="pre-content"><div><div class="bk_prnt"><p class="small">NCBI Bookshelf. A service of the National Library of Medicine, National Institutes of Health.</p><p>National Center for Biotechnology Information (US). Genes and Disease [Internet]. Bethesda (MD): National Center for Biotechnology Information (US); 1998-. </p></div><div class="iconblock clearfix whole_rhythm no_top_margin bk_noprnt"><a class="img_link icnblk_img" title="Table of Contents Page" href="/books/n/gnd/"><img class="source-thumb" src="/corehtml/pmc/pmcgifs/bookshelf/thumbs/th-gnd-lrg.png" alt="Cover of Genes and Disease" height="100px" width="80px" /></a><div class="icnblk_cntnt eight_col"><h2>Genes and Disease [Internet].</h2><a data-jig="ncbitoggler" href="#__NBK22172_dtls__">Show details</a><div style="display:none" class="ui-widget" id="__NBK22172_dtls__"><div>National Center for Biotechnology Information (US).</div><div>Bethesda (MD): <a href="https://www.ncbi.nlm.nih.gov/" ref="pagearea=page-banner&targetsite=external&targetcat=link&targettype=publisher">National Center for Biotechnology Information (US)</a>; 1998-.</div></div><div class="half_rhythm"><ul class="inline_list"><li style="margin-right:1em"><a class="bk_cntns" href="/books/n/gnd/">Contents</a></li></ul></div><div class="bk_noprnt"><form method="get" action="/books/n/gnd/" id="bk_srch"><div class="bk_search"><label for="bk_term" class="offscreen_noflow">Search term</label><input type="text" title="Search this book" id="bk_term" name="term" value="" data-jig="ncbiclearbutton" /> <input type="submit" class="jig-ncbibutton" value="Search this book" submit="false" style="padding: 0.1em 0.4em;" /></div></form></div></div><div class="icnblk_cntnt two_col"><div class="pagination bk_noprnt"><a class="active page_link prev" href="/books/n/gnd/A10/" title="Previous page in this title">< Prev</a><a class="active page_link next" href="/books/n/gnd/A32/" title="Next page in this title">Next ></a></div></div></div></div></div>
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<div class="main-content lit-style" itemscope="itemscope" itemtype="http://schema.org/CreativeWork"><div class="meta-content fm-sec"><h1 id="_NBK22172_"><span class="title" itemprop="name">The Digestive System</span></h1></div><div class="body-content whole_rhythm" itemprop="text"><div id="_abs_rndgid_" itemprop="description"><div class="graphic"><img src="/books/NBK22172/bin/dig.jpg" alt="Image dig.jpg" /></div><p>Digestion is the process of turning food into fuel for energy, and for
|
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maintenance of the body structure. The digestive tract is a series of hollow organs joined in a long,
|
|
twisting tube from the mouth to the anus. Inside this tube is a lining called
|
|
the mucosa. In the mouth, stomach, and small intestine, the mucosa contains
|
|
tiny glands that produce enzymes to help digest food. There are also two solid
|
|
digestive organs, the liver and the pancreas, which produce enzymes that reach
|
|
the intestine through small tubes.</p><p>During the digestive process, food passes down the throat, through the esophagus,
|
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and into the stomach, where food continues to be broken down. The partially digested
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food passes into a short tube called the duodenum — the first part of the small
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intestine. The jejunum and ileum are also part of the small intestine. The liver,
|
|
the gallbladder, and the pancreas produce enzymes and substances to help with
|
|
digestion in the small intestine. After the digestive process is complete, the
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resulting waste travels downstream to the colon. The colon and rectum are parts
|
|
of the body's digestive system, which removes nutrients from food and stores waste
|
|
until it passes out of the body. Together, the colon and rectum form a long, muscular
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tube called the large intestine.</p><p>The health of your digestive system has a lot to do with lifestyle — the food you
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eat, the amount of exercise you get, and the pace and stress level of your day.
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However, some digestive diseases, such as those discussed here, are thought to be
|
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hereditary or stem from an infection. For others, there is no known cause.</p></div><div id="A25.diseases"><h2 id="_A25_diseases_">Diseases</h2><ul class="simple-list"><li class="half_rhythm"><div>
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<a href="/books/n/gnd/coloncancer/">Colon cancer</a>
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</div></li><li class="half_rhythm"><div>
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<a href="/books/n/gnd/crohnsdisease/">Crohn's disease</a>
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</div></li><li class="half_rhythm"><div>
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<a href="/books/n/gnd/cysticfibrosis/">Cystic fibrosis</a>
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</div></li><li class="half_rhythm"><div>
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<a href="/books/n/gnd/diabetestype1/">Diabetes, type 1</a>
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</div></li><li class="half_rhythm"><div>
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