https://www.khanacademy.org/science/cambridge-o-level-biology-cie/x2a084a90105205d2:human-nutrition/x2a084a90105205d2:human-digestive-system/v/human-digestive-system-ur 2025-08-07T23:35:51.501752344Z Human Digestive System Created by Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Human Digestive System Created by Khan Academy https://cdn.kastatic.org/ka-youtube-converted/ge7h4KoLvEw.mp4/ge7h4KoLvEw.mp4 492 Human digestive system https://www.khanacademy.org/science/health-and-medicine/gastro-intestinal-system/gastrointestinal-intro/v/meet-the-gastrointestinal-tract 2024-04-04T15:34:20.714536152Z Meet the gastrointestinal tract! The gastrointestinal tract is the path food takes from mouth to anus. It consists of the mouth (chewing, enzyme-assisted breakdown), esophagus (food propulsion), stomach (churning, storage), small intestine (nutrient absorption, hydrolysis), large intestine (absorbing water, ions, vitamins), rectum (storing waste), and anus (expelling waste). Each part plays a crucial role in digestion. Raja Narayan video https://cdn.kastatic.org/googleusercontent/4n3Ak0EWQ9EMBtxMaheZL3dbdraIhIJANOnyoCij5pvFYcNlGXXjV-ZAS4FoUe65kSW4Wbq-LNDBNTfGmO1CaJL6 Meet the gastrointestinal tract! The gastrointestinal tract is the path food takes from mouth to anus. It consists of the mouth (chewing, enzyme-assisted breakdown), esophagus (food propulsion), stomach (churning, storage), small intestine (nutrient absorption, hydrolysis), large intestine (absorbing water, ions, vitamins), rectum (storing waste), and anus (expelling waste). Each part plays a crucial role in digestion. https://cdn.kastatic.org/ka-youtube-converted/Oh_Pt_UrtEE.mp4/Oh_Pt_UrtEE.mp4 321 Human digestive system https://www.khanacademy.org/science/health-and-medicine/gastro-intestinal-system/gastrointestinal-intro/v/mouth 2023-08-17T23:33:36.770424498Z Mouth Discover the role of the mouth in digestion, from mastication to the creation of a food bolus. Learn about the tongue's intrinsic and extrinsic muscles, the enzymes involved in hydrolysis, and the glands that contribute to this process. Understand the importance of maintaining a neutral pH in the mouth for optimal oral health. Raja Narayan video https://cdn.kastatic.org/googleusercontent/YwdIOYLswhLLgkW3mJxsIdyw3uunO8Vaju26Jgmgz1tzEenCc_fCM1QjunCRTrPsqkWm8FkEWqX4FankjK5Mgy15 Mouth Discover the role of the mouth in digestion, from mastication to the creation of a food bolus. Learn about the tongue's intrinsic and extrinsic muscles, the enzymes involved in hydrolysis, and the glands that contribute to this process. Understand the importance of maintaining a neutral pH in the mouth for optimal oral health. https://cdn.kastatic.org/ka-youtube-converted/KyEk35-Uwh0.mp4/KyEk35-Uwh0.mp4 450 Human digestive system https://www.khanacademy.org/science/cambridge-o-level-biology-cie/x2a084a90105205d2:human-nutrition/x2a084a90105205d2:human-digestive-system/v/teeth-in 2025-07-09T07:49:55.125301995Z Teeth Let's learn about Teeth Skyloom (Dubbing) video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Teeth Let's learn about Teeth https://cdn.kastatic.org/ka-youtube-converted/XtRa-FI0YgU.mp4/XtRa-FI0YgU.mp4 467 Human digestive system https://www.khanacademy.org/science/health-and-medicine/gastro-intestinal-system/gastrointestinal-intro/v/esophagus 2025-09-03T08:00:45.258220483Z Esophagus Explore the esophagus, the tube connecting our mouth to our stomach. Understand its structure, divided into thirds, with skeletal muscle at the top, a mix in the middle, and smooth muscle at the bottom. Learn about the role of the esophagus in peristalsis, the wave-like propulsion of food, and the unique function of the upper and lower esophageal sphincters. Raja Narayan video https://cdn.kastatic.org/googleusercontent/UMQHu_KMC1CUXGlBr0TLEGY12PWgjZdoWRy8zDdbcW9OHyuO_M2F2IIBmKi_TGT5yPbJWhMSRH2n2Yr8frAWjJf64A Esophagus Explore the esophagus, the tube connecting our mouth to our stomach. Understand its structure, divided into thirds, with skeletal muscle at the top, a mix in the middle, and smooth muscle at the bottom. Learn about the role of the esophagus in peristalsis, the wave-like propulsion of food, and the unique function of the upper and lower esophageal sphincters. https://cdn.kastatic.org/ka-youtube-converted/wU9_daCwr_w.mp4/wU9_daCwr_w.mp4 334 Human digestive system https://www.khanacademy.org/science/health-and-medicine/gastro-intestinal-system/gastrointestinal-intro/v/stomach 2023-08-17T23:33:36.770424498Z Stomach he human stomach is a marvel, capable of storing up to four liters of food and playing a crucial role in digestion. This process involves receiving a bolus of food, churning it, and breaking it down through hydrolysis, resulting in a product called chyme. The stomach's anatomy, including parietal cells, chief cells, and mucus cells, facilitates this complex process. Raja Narayan video https://cdn.kastatic.org/googleusercontent/UbUFydKMjHgcYLNLqFVxJa8_VKdVtiwSGQtORDlqJtrSKV8u24x2mWQc3HRr282Iw1Fieb_uxTo80a04lSCu8iU43Q Stomach he human stomach is a marvel, capable of storing up to four liters of food and playing a crucial role in digestion. This process involves receiving a bolus of food, churning it, and breaking it down through hydrolysis, resulting in a product called chyme. The stomach's anatomy, including parietal cells, chief cells, and mucus cells, facilitates this complex process. https://cdn.kastatic.org/ka-youtube-converted/OzLoUCCASwM.mp4/OzLoUCCASwM.mp4 358 Human digestive system https://www.khanacademy.org/science/cambridge-o-level-biology-cie/x2a084a90105205d2:human-nutrition/x2a084a90105205d2:human-digestive-system/v/small-intestine-1-structure-ur 2025-08-07T23:35:51.501752344Z Small intestine 1: Structure Created by Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Small intestine 1: Structure Created by Khan Academy https://cdn.kastatic.org/ka-youtube-converted/m8cNm2rVb1U.mp4/m8cNm2rVb1U.mp4 390 Human digestive system https://www.khanacademy.org/science/health-and-medicine/gastro-intestinal-system/gastrointestinal-intro/v/small-intestine-part-1 2023-08-17T23:33:36.770424498Z Small intestine 1: Structure Explore the small intestine's role in digestion and nutrient absorption. Learn about the three parts: the duodenum, where most digestion occurs, the jejunum, where nutrients are absorbed, and the ileum, where important vitamins are absorbed. Discover the role of villi and microvilli in increasing surface area for digestion. Raja Narayan video https://cdn.kastatic.org/googleusercontent/NycwGTv_yI9wEe7k-SE90NIyTwaxLK6jcmIl6Nmd-hpjAs98CayYtS8GONOhgKGG_UtQ0CXVOawjkkSvT7lKBvzndw Small intestine 1: Structure Explore the small intestine's role in digestion and nutrient absorption. Learn about the three parts: the duodenum, where most digestion occurs, the jejunum, where nutrients are absorbed, and the ileum, where important vitamins are absorbed. Discover the role of villi and microvilli in increasing surface area for digestion. https://cdn.kastatic.org/ka-youtube-converted/UgnF1w-H8vw.mp4/UgnF1w-H8vw.mp4 390 Human digestive system https://www.khanacademy.org/science/health-and-medicine/gastro-intestinal-system/gastrointestinal-intro/v/small-intestine-part-2-digestion 2023-08-17T23:33:36.770424498Z Small intestine 2: Digestion This video explores the digestion process, focusing on the breakdown of four major macromolecules: proteins, carbohydrates, nucleotides, and fats. It highlights the role of various enzymes in this process, and how the pancreas and brush border contribute to digestion. The video also touches on temporary lactose intolerance due to stomach flu. Raja Narayan video https://cdn.kastatic.org/googleusercontent/7SeJGJeVEe-oj4cYkzJQGYYvnmYZ5Rp-B6DgklmRZxNH0YQo0qO3lGk_yAcy4dW5HylO5g_a8p_6sAAJiF-3XcwW Small intestine 2: Digestion This video explores the digestion process, focusing on the breakdown of four major macromolecules: proteins, carbohydrates, nucleotides, and fats. It highlights the role of various enzymes in this process, and how the pancreas and brush border contribute to digestion. The video also touches on temporary lactose intolerance due to stomach flu. https://cdn.kastatic.org/ka-youtube-converted/nLCNoT79_-o.mp4/nLCNoT79_-o.mp4 405 Human digestive system https://www.khanacademy.org/science/health-and-medicine/gastro-intestinal-system/gastrointestinal-intro/v/colon-rectum-anus 2023-08-17T23:33:36.770424498Z Colon, rectum, and anus Explore the final part of the gastrointestinal tract, the large intestine, rectum, and anus. Understand their roles in absorbing water, inorganic ions, and aiding in digestion with the help of microorganisms. Learn about the implications of water absorption on conditions like diarrhea and constipation, and the importance of the rectum and anus in waste storage and expulsion. Raja Narayan video https://cdn.kastatic.org/googleusercontent/IYauP3hJUV5MIH24qZ1Lg0gwG1SgLBNIRZz_BlEIOD2GcLovGiH6OYlxS0yDeneKBt0mv3nHGyoCEy9d97pChxg0dA Colon, rectum, and anus Explore the final part of the gastrointestinal tract, the large intestine, rectum, and anus. Understand their roles in absorbing water, inorganic ions, and aiding in digestion with the help of microorganisms. Learn about the implications of water absorption on conditions like diarrhea and constipation, and the importance of the rectum and anus in waste storage and expulsion. https://cdn.kastatic.org/ka-youtube-converted/Lzr9GGjh6YQ.mp4/Lzr9GGjh6YQ.mp4 585 Human digestive system https://www.khanacademy.org/science/hs-bio/x230b3ff252126bb6:from-cells-to-organisms/x230b3ff252126bb6:human-body-systems/a/hs-the-circulatory-system-review 2024-05-06T19:22:43.24334365Z The circulatory system review Learn about the organs and functions of the circulatory system. article https://www.khanacademy.org/science/cambridge-o-level-biology-cie/x2a084a90105205d2:human-nutrition/x2a084a90105205d2:human-digestive-system/e/mouth-and-buccal-cavity 2025-11-24T17:20:50.952945651Z Mouth and Buccal Cavity This exercise covers the structure and function of teeth, tongue papillae, and the palates, focusing on chewing, taste, and swallowing. Students will interpret diagrams, match structures to functions, and apply knowledge to real-life scenarios. Khan Academy exercise https://www.khanacademy.org/science/cambridge-o-level-biology-cie/x2a084a90105205d2:human-nutrition/x2a084a90105205d2:diet/e/digestion-in-intestines 2026-03-31T17:15:33.948437145Z Digestion in Intestines Let's practice on the digestive processes that take place in our intestines. Saiyem exercise https://www.khanacademy.org/science/cambridge-o-level-biology-cie/x2a084a90105205d2:human-nutrition/x2a084a90105205d2:human-digestive-system/e/histology-of-alimentary-canal 2025-11-24T17:20:50.952945651Z Histology of Alimentary Canal This exercise covers gut wall layers, their roles in peristalsis, secretion, and nutrient absorption, and how villi and microvilli maximize digestive efficiency. Students will interpret diagrams and link structure to function. Khan Academy exercise https://www.khanacademy.org/science/cambridge-o-level-biology-cie/x2a084a90105205d2:human-nutrition/x2a084a90105205d2:human-digestive-system/e/digestion-in-humans 2026-04-09T13:10:38.304888012Z Digestion in humans Let's solve a few questions on the digestive system in a human body. Revathi exercise