https://www.khanacademy.org/science/health-and-medicine/human-anatomy-and-physiology/introduction-to-the-kidneys/v/how-do-our-kidneys-work 2023-04-19T21:14:29.759927248Z Kidney function and anatomy Kidneys are important organs that filter our blood and produce urine to maintain balance (homeostasis) in our body. Blood enters the kidneys through renal arteries and exits through renal veins. The nephron, the smallest functional unit of the kidney, handles filtration and collection. This process helps regulate pH, blood pressure, and waste removal. Raja Narayan video https://cdn.kastatic.org/googleusercontent/0FPGWziOxoyH20df0kHMKk9uFDhZWY_e5jSvsBB72SSb3YLd12Bg34X5HYa0EaTbSv15YZun38k0h0jnyZGKpQj6 Kidney function and anatomy Kidneys are important organs that filter our blood and produce urine to maintain balance (homeostasis) in our body. Blood enters the kidneys through renal arteries and exits through renal veins. The nephron, the smallest functional unit of the kidney, handles filtration and collection. This process helps regulate pH, blood pressure, and waste removal. https://cdn.kastatic.org/ka-youtube-converted/ctGkLYuUCvU.mp4/ctGkLYuUCvU.mp4 478 The excretory system 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 The excretory system 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 The excretory system https://www.khanacademy.org/science/strengthened-shs-biology-2/x62f5297cda63eb8d:plant-organ-systems/x62f5297cda63eb8d:the-excretory-system/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/how-does-the-human-body-work/x0fe8768432761c62:excretory-products-and-their-elimination/x0fe8768432761c62:function-and-mechanism-of-the-human-respiratory-system/e/the-kidneys 2026-04-07T23:36:17.218592739Z 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/strengthened-shs-biology-2/x62f5297cda63eb8d:plant-organ-systems/x62f5297cda63eb8d:the-excretory-system/a/renal-physiology-glomerular-filtration 2022-07-19T19:47:48.224682081Z Renal physiology: Glomerular filtration article https://www.khanacademy.org/science/strengthened-shs-biology-2/x62f5297cda63eb8d:plant-organ-systems/x62f5297cda63eb8d:the-excretory-system/a/renal-physiology-counter-current-multiplication 2025-04-14T22:34:53.782134477Z Renal physiology: Counter current multiplication article https://www.khanacademy.org/science/health-and-medicine/human-anatomy-and-physiology/introduction-to-the-kidneys/v/urination 2023-04-19T21:14:29.759927248Z Urination Micturition (peeing) starts with urine flowing from the kidneys to the bladder via ureters. The bladder expands using transitional epithelium. Urine exits through the urethra, controlled by internal and external urethral sphincters. Ureters prevent backflow, thereby reducing infection risk. Raja Narayan video https://cdn.kastatic.org/googleusercontent/Hn49qOfQs8YeGZpoUolS8YA1FVj82YiaCwyiZapt56pbaNaCkPqftKh2jXXaQ-QMPTlsS8xy0iLui1LjVYfXMIO9rw Urination Micturition (peeing) starts with urine flowing from the kidneys to the bladder via ureters. The bladder expands using transitional epithelium. Urine exits through the urethra, controlled by internal and external urethral sphincters. Ureters prevent backflow, thereby reducing infection risk. https://cdn.kastatic.org/ka-youtube-converted/rheO1tVyB0U.mp4/rheO1tVyB0U.mp4 573 The excretory system https://www.khanacademy.org/science/bridge-course-class-10th-science/x37589313f9a4c197:untitled-78/x37589313f9a4c197:excretion/e/excretion-in-humans 2026-04-07T22:59:30.107127435Z Excretion in humans Let's solve some questions on excretion in humans Vibhor Pandey exercise https://www.khanacademy.org/science/in-in-class-10-biology/in-in-life-processes/in-in-excretion-in-human-beings/e/excretion-in-human-beings 2026-03-05T08:50:45.400692349Z Excretion in human beings This exercises assesses student's understanding of structure and function of excretory system at an elementary level. saiyem exercise 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 The excretory system https://www.khanacademy.org/science/up-biology-grade-11-revision-course-full-term/x01ceb15d0be61009:week-2/x01ceb15d0be61009:untitled-612/e/excretion-in-animals 2026-04-08T00:54:09.631945657Z Excretion in animals This exercise tests your knowledge of ammonotelism, ureotelism, uricotelism, and excretory organs in different animals. Moumita Sen exercise