{"id":10377,"date":"2019-04-12T10:37:18","date_gmt":"2019-04-12T10:37:18","guid":{"rendered":"http:\/\/www.natgeokids.com\/?p=10377"},"modified":"2019-04-17T14:37:36","modified_gmt":"2019-04-17T14:37:36","slug":"your-digestive-system","status":"publish","type":"post","link":"https:\/\/www.natgeokids.com\/ie\/discover\/science\/general-science\/your-digestive-system\/","title":{"rendered":"Human digestive system"},"content":{"rendered":"<p><strong>Follow Nat Geo Kids as we take a journey down through the human digestive system to find out where our grub goes!<\/strong><\/p>\n<p>&nbsp;<\/p>\n<h2>The human digestive system<\/h2>\n<p>It takes around\u00a0<strong>24 hours<\/strong>\u00a0for your dinner to wind its way through the\u00a0<strong>nine-metre-long digestive tract<\/strong>. On its trip, it\u2019s mixed with acids and digestive juices, and squeezed and squelched until all the nutrients that the body needs are absorbed. Then, the smelly leftovers, along with billions of dead bacteria, are ready to exit the body. <em>Plop<\/em>!<\/p>\n<p>Let\u2019s follow your food to learn about the brilliant bits of our bodies that make up the human digestive system&#8230;<\/p>\n<p>&nbsp;<\/p>\n<h2 style=\"text-align: center;\">Mouth<\/h2>\n<p><img decoding=\"async\" class=\"size-full wp-image-25013 aligncenter\" src=\"https:\/\/cdn.creatureandcoagency.com\/uploads\/2019\/04\/Human-digestive-system-mouth.jpg\" alt=\"Human digestive system mouth illustration\" width=\"635\" height=\"404\" srcset=\"https:\/\/cdn.creatureandcoagency.com\/uploads\/2019\/04\/Human-digestive-system-mouth.jpg 635w, https:\/\/cdn.creatureandcoagency.com\/uploads\/2019\/04\/Human-digestive-system-mouth-300x191.jpg 300w\" sizes=\"(max-width: 635px) 100vw, 635px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: left;\">It all starts here! Up to <strong>28 strong\u00a0teeth<\/strong>* chomp your food, breaking it into smaller bits. Meanwhile, the\u00a0<strong>tongue<\/strong>\u00a0keeps moving the food around, shifting it to the type of teeth that will be best at munching it. It also squeezes the chewed grub into swallowable lumps, pushing them back towards the throat. <em>Gulp<\/em>!<\/p>\n<p>&nbsp;<\/p>\n<blockquote>\n<p style=\"text-align: left;\"><strong>Fast fact:<\/strong> When you swallow, a little flap of cartilage called the <strong>epiglottis<\/strong> closes off the windpipe so food doesn\u2019t go down there by mistake.<\/p>\n<\/blockquote>\n<p>&nbsp;<\/p>\n<p style=\"text-align: left;\">Here, you&#8217;ll also find the <strong>salivary glands<\/strong> that\u00a0produce most of the slimy liquid in your mouth.\u00a0This\u00a0saliva\u00a0moistens food, making it easier to swallow. It\u2019s also full of chemicals called\u00a0<strong>enzymes<\/strong>\u00a0that help to break down food. Amazingly, just the\u00a0smell\u00a0of good grub can make your mouth start to water!<\/p>\n<p>&nbsp;<\/p>\n<blockquote><p><strong>Fast fact:<\/strong>\u00a0Your salivary glands can produce up to six cups of saliva per day. Squelch!<\/p><\/blockquote>\n<h6><\/h6>\n<h6 style=\"text-align: left;\">*MOST GROWN-UPS HAVE 32 TEETH. YOU USUALLY GROW FOUR \u2018WISDOM\u2019 TEETH BETWEEN THE AGES OF 17 AND 24.<\/h6>\n<p>&nbsp;<\/p>\n<h2 style=\"text-align: center;\">Oesophagus<\/h2>\n<p><img decoding=\"async\" class=\"size-full wp-image-25014 aligncenter\" src=\"https:\/\/cdn.creatureandcoagency.com\/uploads\/2019\/04\/Human-digestive-system-oesophagus.jpg\" alt=\"Human digestive system oesophagus illustration\" width=\"635\" height=\"404\" srcset=\"https:\/\/cdn.creatureandcoagency.com\/uploads\/2019\/04\/Human-digestive-system-oesophagus.jpg 635w, https:\/\/cdn.creatureandcoagency.com\/uploads\/2019\/04\/Human-digestive-system-oesophagus-300x191.jpg 300w\" sizes=\"(max-width: 635px) 100vw, 635px\" \/><\/p>\n<p style=\"text-align: left;\">Also known as the\u00a0gullet, this <strong>25cm-long tube<\/strong> contracts to shift chewed food down to your <strong>stomach<\/strong>. The squeezing motion of the muscles is called\u00a0<strong>peristalsis<\/strong>\u00a0and it occurs throughout the digestive system. A slimy mucus is also oozed from the oesophagus to help the food on its way. Easy does it!<\/p>\n<p>&nbsp;<\/p>\n<blockquote>\n<p style=\"text-align: center;\"><strong>Fast fact:<\/strong> Thanks to peristalsis, food would get to your stomach even if you were standing on your head!<\/p>\n<\/blockquote>\n<p>&nbsp;<\/p>\n<h2 style=\"text-align: center;\">Stomach<\/h2>\n<p><img decoding=\"async\" class=\"size-full wp-image-25016 aligncenter\" src=\"https:\/\/cdn.creatureandcoagency.com\/uploads\/2019\/04\/Human-digestive-system-stomach.jpg\" alt=\"Human digestive system stomach illustration\" width=\"635\" height=\"404\" srcset=\"https:\/\/cdn.creatureandcoagency.com\/uploads\/2019\/04\/Human-digestive-system-stomach.jpg 635w, https:\/\/cdn.creatureandcoagency.com\/uploads\/2019\/04\/Human-digestive-system-stomach-300x191.jpg 300w\" sizes=\"(max-width: 635px) 100vw, 635px\" \/><\/p>\n<p style=\"text-align: left;\">Next stop on our journey through the human digestive system \u2014 the stomach! This <strong>stretchy muscular bag<\/strong> is about the size of a\u00a0tennis ball\u00a0when it\u2019s empty, but expands to the size of a\u00a0football\u00a0to store a massive meal. As soon as food plops inside, the stomach lining releases digestive juices and acid that break down the food even more, killing harmful\u00a0bacteria. Muscles slosh and squelch the food together with the juices until it becomes a sloppy soup called\u00a0<strong>chyme<\/strong>\u00a0that\u2019s ready to be squirted into the\u00a0small intestine\u2026<\/p>\n<p>&nbsp;<\/p>\n<blockquote>\n<p style=\"text-align: center;\"><strong>Fast fact:<\/strong> The acid in your stomach is so strong it could dissolve an iron nail!* To stop your stomach digesting itself, it\u2019s lined with a protective mucus, and your stomach cells are replaced every few days.<\/p>\n<\/blockquote>\n<h6 style=\"text-align: center;\">* Please do not eat a nail. Ever.<\/h6>\n<p>&nbsp;<\/p>\n<h2 style=\"text-align: center;\">Intestines<\/h2>\n<p><img decoding=\"async\" class=\"size-full wp-image-25011 aligncenter\" src=\"https:\/\/cdn.creatureandcoagency.com\/uploads\/2019\/04\/Human-digestive-system-intestines.jpg\" alt=\"Human digestive system intestines illustration\" width=\"635\" height=\"404\" srcset=\"https:\/\/cdn.creatureandcoagency.com\/uploads\/2019\/04\/Human-digestive-system-intestines.jpg 635w, https:\/\/cdn.creatureandcoagency.com\/uploads\/2019\/04\/Human-digestive-system-intestines-300x191.jpg 300w\" sizes=\"(max-width: 635px) 100vw, 635px\" \/><\/p>\n<p>Despite the name, the small\u00a0intestine\u00a0is really not that small \u2014 it\u2019s a whopping <strong>6.5 metres long<\/strong>! It\u2019s in this <strong>3cm-wide tube<\/strong> that all the\u00a0nutrients\u00a0in your mushed-up food pass through the\u00a0small-intestine\u00a0lining and into the\u00a0blood. Once all the goodness is gone, the sloppy mixture passes to the next part of the intestines\u2026<\/p>\n<p>&nbsp;<\/p>\n<blockquote>\n<p style=\"text-align: center;\"><strong>Fast fact:<\/strong>\u00a0The lining of the small intestine is covered with teeny finger-like bumps called \u201cvilli\u201d. They give the lining a large surface area to help with absorbing nutrients.<\/p>\n<\/blockquote>\n<p>&nbsp;<\/p>\n<p>More than twice as wide as the small intestine, but only <strong>1.5 metres long<\/strong>, the large intestine&#8217;s job is to soak up water, salts and minerals from the indigestible leftovers. Finally, the remaining semi-solid waste, called\u00a0faeces, travels to the\u00a0<strong>lower colon<\/strong>\u00a0and <strong>rectum<\/strong> for storage. When you go to the loo, a ring of muscle called the anus\u00a0relaxes to allow the poo out! Super and stinky!<\/p>\n<p>&nbsp;<\/p>\n<blockquote>\n<p style=\"text-align: center;\"><strong>Fast fact:<\/strong> Your small and large intestines together are known as your bowels!<\/p>\n<\/blockquote>\n<p>&nbsp;<\/p>\n<h2 style=\"text-align: center;\">Liver<\/h2>\n<p><img decoding=\"async\" class=\"size-full wp-image-25012 aligncenter\" src=\"https:\/\/cdn.creatureandcoagency.com\/uploads\/2019\/04\/Human-digestive-system-liver.jpg\" alt=\"Human digestive system liver\" width=\"635\" height=\"404\" srcset=\"https:\/\/cdn.creatureandcoagency.com\/uploads\/2019\/04\/Human-digestive-system-liver.jpg 635w, https:\/\/cdn.creatureandcoagency.com\/uploads\/2019\/04\/Human-digestive-system-liver-300x191.jpg 300w\" sizes=\"(max-width: 635px) 100vw, 635px\" \/><\/p>\n<p>This busy brown organ plays an important role in the human digestive system \u2014 \u00a0it&#8217;s your largest internal organ and has about\u00a0<strong>500 different jobs<\/strong>! It\u2019s like a chemical processing factory\u00a0\u2014 blood carries nutrients there from the small intestine, then the <strong>liver<\/strong> decides what to do with them. It also gets rid of\u00a0toxins\u00a0(substances that can be harmful to the body),\u00a0recycles old blood cells, makes bile and other digestive juices, and produces, stores and releases\u00a0glucose\u00a0(to give you energy).<\/p>\n<p>&nbsp;<\/p>\n<blockquote>\n<p style=\"text-align: center;\"><strong>Fast fact:<\/strong> About\u00a0one third\u00a0of the body\u2019s blood flows through the liver every minute!<\/p>\n<\/blockquote>\n<p>&nbsp;<\/p>\n<h2 style=\"text-align: center;\">Gallbladder<\/h2>\n<p><img decoding=\"async\" class=\"size-full wp-image-25010 aligncenter\" src=\"https:\/\/cdn.creatureandcoagency.com\/uploads\/2019\/04\/Human-digestive-system-gallbladder.jpg\" alt=\"Human digestive system gallbladder illustration\" width=\"635\" height=\"404\" srcset=\"https:\/\/cdn.creatureandcoagency.com\/uploads\/2019\/04\/Human-digestive-system-gallbladder.jpg 635w, https:\/\/cdn.creatureandcoagency.com\/uploads\/2019\/04\/Human-digestive-system-gallbladder-300x191.jpg 300w\" sizes=\"(max-width: 635px) 100vw, 635px\" \/><\/p>\n<p>The role of this green, pear-shaped organ is to store bile (a liquid that aids digestion) and make it thicker and stronger before adding it to the small intestine.<\/p>\n<p>&nbsp;<\/p>\n<h4 style=\"text-align: center;\">Did you know that we have FREE downloadable <a href=\"https:\/\/www.natgeokids.com\/ie\/primary-resource\/digestive-system-science\/\" target=\"_blank\" rel=\"noopener\"><em>Human Digestive System Primary Resource<\/em><\/a>? Great for teachers, homeschoolers and parents alike!<\/h4>\n<p>&nbsp;<\/p>\n<h2 style=\"text-align: center;\">Pancreas<\/h2>\n<p><img decoding=\"async\" class=\"size-full wp-image-25015 aligncenter\" src=\"https:\/\/cdn.creatureandcoagency.com\/uploads\/2019\/04\/Human-digestive-system-pancreas.jpg\" alt=\"Human digestive system pancreas illustration\" width=\"635\" height=\"404\" srcset=\"https:\/\/cdn.creatureandcoagency.com\/uploads\/2019\/04\/Human-digestive-system-pancreas.jpg 635w, https:\/\/cdn.creatureandcoagency.com\/uploads\/2019\/04\/Human-digestive-system-pancreas-300x191.jpg 300w\" sizes=\"(max-width: 635px) 100vw, 635px\" \/><\/p>\n<p>Your <strong>pancreas<\/strong>\u00a0sits just behind the stomach and makes chemicals called enzymes which help digest nutrients in your food. It also makes insulin, a hormone which helps control your blood sugar levels.<\/p>\n<p>&nbsp;<\/p>\n<h2 style=\"text-align: center;\">Appendix<\/h2>\n<p><img decoding=\"async\" class=\"size-full wp-image-25009 aligncenter\" src=\"https:\/\/cdn.creatureandcoagency.com\/uploads\/2019\/04\/Human-digestive-system-appendix.jpg\" alt=\"Human digestive system appendix illustration\" width=\"635\" height=\"404\" srcset=\"https:\/\/cdn.creatureandcoagency.com\/uploads\/2019\/04\/Human-digestive-system-appendix.jpg 635w, https:\/\/cdn.creatureandcoagency.com\/uploads\/2019\/04\/Human-digestive-system-appendix-300x191.jpg 300w\" sizes=\"(max-width: 635px) 100vw, 635px\" \/><\/p>\n<p>Doctors used to think that this thin little organ was useless \u2014 a leftover body part from early humans. But today it\u2019s thought that the appendix stores \u201cgood bacteria\u201d that can help your digestive system work again after you\u2019ve been poorly.<\/p>\n<p>&nbsp;<\/p>\n<h2 style=\"text-align: center;\">What did you think of our journey through the human digestive system? Leave a comment below and let us know&#8230;<\/h2>\n<p>&nbsp;<\/p>\n<h6>Pancreas image: DK \/ Superhuman Encyclopedia. All other images: Getty Images UK.<br \/>\nWith thanks to Dr Dewi Byrne.<\/h6>\n","protected":false},"excerpt":{"rendered":"<p>Follow Nat Geo Kids as we take a journey down through the human digestive system to find out where our grub goes! &nbsp; The human digestive system It takes around\u00a024 hours\u00a0for your dinner to wind its way through the\u00a0nine-metre-long digestive tract. On its trip, it\u2019s mixed with acids and digestive juices, and squeezed and squelched &hellip; <a href=\"https:\/\/www.natgeokids.com\/ie\/discover\/science\/general-science\/your-digestive-system\/\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Human digestive system<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":25018,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[27],"tags":[609,1149,615,644,2425,1686,2423,2120,474,2421,2422,611,613,2291,614,2424,618,947],"christmas-category":[],"class_list":["post-10377","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-general-science","tag-appendix","tag-bacteria","tag-digestion","tag-education","tag-enzymes","tag-food","tag-gallbladder","tag-health","tag-human-body","tag-human-digestive-system","tag-intestine","tag-liver","tag-mouth","tag-nutrition","tag-oesophagus","tag-pancreas","tag-salivary-glands","tag-science","countries-australia","countries-ireland","countries-new-zealand","countries-south-africa","countries-united-kingdom"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - 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