https://www.khanacademy.org/science/hs-bio/x230b3ff252126bb6:from-cells-to-organisms/x230b3ff252126bb6:untitled-26/v/organization-of-multicellular-organisms 2024-05-06T19:22:43.24334365Z Organization of multicellular organisms Multicellular organisms have a hierarchical structural organization: cells make up tissues, tissues make up organs, and organs make up organ systems. Organ systems work together to carry out the many functions of the organism. Sal Khan video https://cdn.kastatic.org/ka_thumbnails_cache/bab7af19-6568-454a-8832-bd8ec95e106c_1280_720_base.png Organization of multicellular organisms Multicellular organisms have a hierarchical structural organization: cells make up tissues, tissues make up organs, and organs make up organ systems. Organ systems work together to carry out the many functions of the organism. https://cdn.kastatic.org/ka-youtube-converted/8pWMifyG5bU.mp4/8pWMifyG5bU.mp4 256 Animal and plant organ systems https://www.khanacademy.org/science/bridge-course-class-10th-science/x37589313f9a4c197:untitled-78/x37589313f9a4c197:life-processes/v/human-digestive-system-in 2025-01-14T13:46:46.197485586Z Human Digestive System The fascinating journey of food through the human digestive system! From the mouth, where digestion begins with saliva, to the stomach, where gastric juices work their magic, and finally to the small and large intestines, where nutrients are absorbed and waste is processed—every step is an incredible process. Learn how organs like the liver, pancreas, and gallbladder play vital roles in breaking down food and supporting digestion. This video breaks down the complex digestive system into simple, easy-to-understand steps. Shankar Nair video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Human Digestive System The fascinating journey of food through the human digestive system! From the mouth, where digestion begins with saliva, to the stomach, where gastric juices work their magic, and finally to the small and large intestines, where nutrients are absorbed and waste is processed—every step is an incredible process. Learn how organs like the liver, pancreas, and gallbladder play vital roles in breaking down food and supporting digestion. This video breaks down the complex digestive system into simple, easy-to-understand steps. https://cdn.kastatic.org/ka-youtube-converted/2uL4b1yMhm8.mp4/2uL4b1yMhm8.mp4 492 Animal and plant organ systems https://www.khanacademy.org/science/mh-class-7-science-revision-course/x16e69e7a3344a1ee:week-3/x16e69e7a3344a1ee:untitled-318/e/parts-of-the-digestive-system 2026-06-15T02:00:46.78238584Z Parts of the digestive system Let's practice vibhor exercise https://www.khanacademy.org/science/class-7-science/x0c8b40bd4b242f0b:nutrition-in-animals/x0c8b40bd4b242f0b:digestion-in-humans/e/digestion-in-humans-and-herbivores 2026-04-27T08:10:46.028809868Z Digestion in humans Let's solve some questions on digestion in humans  Vibhor Pandey exercise https://www.khanacademy.org/science/in-in-class-10-biology/in-in-life-processes/in-in-nutrition-in-human-beings/e/human-digestion 2026-06-08T05:00:48.378277506Z 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/jnv-biology-grade-11-revision-course-full-term/x3ed1e7eacb19007a:week-2/x3ed1e7eacb19007a:untitled-507/v/frog-digestive-system 2023-09-14T11:07:34.466749579Z Frog digestive system Let's explore the frog's digestive system. Khadijatul Qubra video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Frog digestive system Let's explore the frog's digestive system. https://cdn.kastatic.org/ka-youtube-converted/CrkQonnm-ak.mp4/CrkQonnm-ak.mp4 593 Animal and plant organ systems https://www.khanacademy.org/science/hs-bio/x230b3ff252126bb6:from-cells-to-organisms/x230b3ff252126bb6:human-body-systems/a/hs-the-digestive-and-excretory-systems-review 2026-04-27T08:10:46.028809868Z Learn: The digestive and excretory systems review Learn about the organs and functions of the digestive and excretory systems. article https://www.khanacademy.org/science/up-biology-grade-11-revision-course-full-term/x01ceb15d0be61009:week-2/x01ceb15d0be61009:untitled-612/v/excretory-organs-in-animals 2023-05-19T11:51:28.642364191Z Excretory organs in animals Take a look at the different excretory organs of invertebrates. Khadijatul Qubra video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Excretory organs in animals Take a look at the different excretory organs of invertebrates. https://cdn.kastatic.org/ka-youtube-converted/CspzmHuidB0.mp4/CspzmHuidB0.mp4 680 Animal and plant organ systems https://www.khanacademy.org/science/exam-preparation-class-11th-biology/x0c1a8c25d3e07544:week-3/x0c1a8c25d3e07544:excretory-products-and-their-elimination/v/kidneys-and-nephron 2024-12-30T12:17:31.390299683Z Kidneys and Nephron What does the inside of a kidney look like? What does a nephron look like? What are the different parts of a nephron? Watch this video to learn about the anatomy of the kidneys and nephron. Nivedhitha Suresh video https://cdn.kastatic.org/ka_thumbnails_cache/613a4b3b-e88f-4b14-baef-8c9f5d3af4d1_1280_720_base.png Kidneys and Nephron What does the inside of a kidney look like? What does a nephron look like? What are the different parts of a nephron? Watch this video to learn about the anatomy of the kidneys and nephron. https://cdn.kastatic.org/ka-youtube-converted/aDOIHzhRiq0.mp4/aDOIHzhRiq0.mp4 518 Animal and plant organ systems https://www.khanacademy.org/science/biology/human-biology/kidney-nephron/v/the-kidney-and-nephron 2023-08-17T23:33:36.770424498Z The kidney and nephron The video provides a detailed overview of the kidney's smallest functional unit, the nephron. It explains how the nephron filters blood, excretes waste, and maintains water levels. The video also highlights the role of the renal cortex and renal medulla in this process. The loop of Henle's function in reabsorbing water and making the renal medulla salty is also discussed. Sal Khan video https://cdn.kastatic.org/googleusercontent/1dzZmGa2hM6wVfruPS_o88GvZsTC1_uifiL7DkX00WMqNQ8jgr866HOBJglK5XYX6PIn55ZZvxOuaBMXQNFX8I5D The kidney and nephron The video provides a detailed overview of the kidney's smallest functional unit, the nephron. It explains how the nephron filters blood, excretes waste, and maintains water levels. The video also highlights the role of the renal cortex and renal medulla in this process. The loop of Henle's function in reabsorbing water and making the renal medulla salty is also discussed. https://cdn.kastatic.org/ka-youtube-converted/cc8sUv2SuaY.mp4/cc8sUv2SuaY.mp4 1118 Animal and plant organ systems https://www.khanacademy.org/science/cambridge-o-level-biology-cie/x2a084a90105205d2:excretion/x2a084a90105205d2:kidney-and-nephron-function/a/anatomy-of-the-kidney-and-the-nephron 2024-11-26T19:53:32.781965247Z Anatomy of the kidney and the nephron This article provides an overview of the structure of the kidney and the different components of the nephron, as well as its blood supply. article https://www.khanacademy.org/science/cambridge-o-level-biology-cie/x2a084a90105205d2:excretion/x2a084a90105205d2:kidney-and-nephron-function/e/the-kidneys 2026-04-20T05:52:07.909428702Z The human excretory system This exercise contains questions on the structure of kidneys and an overview of their functions. Moumita Sen exercise https://www.khanacademy.org/science/hs-bio/x230b3ff252126bb6:from-cells-to-organisms/x230b3ff252126bb6:human-body-systems/e/apply-organ-system-interactions 2026-04-27T10:10:46.754795089Z Apply: Organ system interactions Apply your understanding of organ system interactions in this set of free, standards-aligned practice questions. Megan Cohn exercise https://www.khanacademy.org/science/kn-class-7-science/x2edacdad2354c760:respiration-in-organisms/x2edacdad2354c760:breathing-in-other-animals/e/respiration-in-plants 2026-04-07T23:36:17.218592739Z Respiration in plants Let's solve questions on respiration in plants Vibhor Pandey exercise