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 Overview and initial digestion https://www.khanacademy.org/science/in-in-class-10-biology/in-in-life-processes/in-in-nutrition-in-human-beings/e/human-digestion 2026-03-27T08:19:15.609072448Z Human digestion Let's learn how human digestion occurs in the mouth, stomach, small, and the large intestine. Saiyem exercise https://www.khanacademy.org/science/hs-bio/x230b3ff252126bb6:from-cells-to-organisms/x230b3ff252126bb6:human-body-systems/a/hs-the-digestive-and-excretory-systems-review 2026-02-11T15:02:15.352609876Z The digestive and excretory systems review Learn about the organs and functions of the digestive and excretory systems. article 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 Overview and initial digestion https://www.khanacademy.org/science/health-and-medicine/gastro-intestinal-system/gastrointestinal-intro/v/teeth 2023-08-17T23:33:36.770424498Z Teeth Explore the structure and function of teeth in the human mouth. Learn about the different types of teeth: incisors, canines, premolars, and molars, and their specific roles in cutting, gripping, and grinding food. Discover why wisdom teeth, or third molars, are often removed and the complications they can cause. Raja Narayan video https://cdn.kastatic.org/googleusercontent/bouh3DC0idEU8ZmOv5ef9YA2UW0zVfFF3T1jiks1EccpIcQBzRGU9ZjuHOhfdDTGIkGgINjwIDJeCUtWEe_kUzu6Rg Teeth Explore the structure and function of teeth in the human mouth. Learn about the different types of teeth: incisors, canines, premolars, and molars, and their specific roles in cutting, gripping, and grinding food. Discover why wisdom teeth, or third molars, are often removed and the complications they can cause. https://cdn.kastatic.org/ka-youtube-converted/9wYbsSrDwbA.mp4/9wYbsSrDwbA.mp4 476 Overview and initial digestion 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 Overview and initial digestion