https://www.khanacademy.org/science/health-and-medicine/human-anatomy-and-physiology/introduction-to-the-kidneys/v/meet-the-kidneys 2023-08-17T23:33:36.770424498Z Meet the kidneys! The kidneys play a vital role in filtering blood and producing urine. Understand how these fist-sized organs receive oxygenated blood, hold onto essential nutrients, and expel waste products. Discover the unique dual capillary system, the vasa recta and peritubular capillaries, that make this process possible. Raja Narayan video https://cdn.kastatic.org/googleusercontent/5k1OWSEHDL2rqpTqZ_0YQRFJjyey3GqT_ZZE8E-3uKOxOVbn8faldAVTLUKAWWYg-Ow-hkUCHzBhMc2GcP8jYZQ4 Meet the kidneys! The kidneys play a vital role in filtering blood and producing urine. Understand how these fist-sized organs receive oxygenated blood, hold onto essential nutrients, and expel waste products. Discover the unique dual capillary system, the vasa recta and peritubular capillaries, that make this process possible. https://cdn.kastatic.org/ka-youtube-converted/mcQQGGShmLs.mp4/mcQQGGShmLs.mp4 384 Structure and function of kidney https://www.khanacademy.org/science/health-and-medicine/human-anatomy-and-physiology/introduction-to-the-kidneys/e/introductory-renal-quiz 2026-04-07T23:36:17.218592739Z Introductory urinary system quiz Introductory renal quiz Rishi exercise 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/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 Structure and function of kidney https://www.khanacademy.org/science/health-and-medicine/circulatory-system/blood-pressure-control/v/parts-of-a-nephron 2020-10-23T18:44:07Z Parts of a nephron Learn about the 5 major parts of the kidney's nephron. Rishi is a pediatric infectious disease physician and works at Khan Academy. Rishi Desai video https://cdn.kastatic.org/googleusercontent/AwM9zsQLqQeobuHlhZSWif-ms9cZowAlGY8hybgEoVMRJtzdT23p5cKACJDZKleVrcMvclyakzsr0gaHYczUW4g Parts of a nephron Learn about the 5 major parts of the kidney's nephron. Rishi is a pediatric infectious disease physician and works at Khan Academy. https://cdn.kastatic.org/ka-youtube-converted/_vBJkK4eocA.mp4/_vBJkK4eocA.mp4 549 Structure and function of kidney https://www.khanacademy.org/science/health-and-medicine/human-anatomy-and-physiology/introduction-to-the-kidneys/e/intermediate-renal-quiz1 2026-04-08T00:54:09.631945657Z Intermediate urinary system quiz Intermediate Renal Quiz Rishi exercise https://www.khanacademy.org/science/grade-10-biology-snc-aligned/x8178f14e6776dea5:human-urinary-system/x8178f14e6776dea5:the-process-of-urine-formation/a/tubular-reabsorption-article 2021-05-25T21:59:59Z Tubular reabsorption article article https://www.khanacademy.org/science/health-and-medicine/human-anatomy-and-physiology/introduction-to-the-kidneys/v/glomerular-filtration-in-the-nephron 2023-08-17T23:33:36.770424498Z Glomerular filtration in the nephron This video explores the renal system, focusing on the nephron's role in kidney function. It details the glomerulus's filtration process, the afferent and efferent arterioles' roles, and the function of Bowman's Capsule. The video also explains why fluid leaks out in the glomerulus but not in other arterioles.Leave feedback   Raja Narayan video https://cdn.kastatic.org/googleusercontent/1V_00oQA_8JDiCfsGzAeugIyvs_r4gv5eEKwBFirDsGTA5zGLKIYBaZKJe0c-b0Cfdk_UN95iTFJORj4yq4N6dj6 Glomerular filtration in the nephron This video explores the renal system, focusing on the nephron's role in kidney function. It details the glomerulus's filtration process, the afferent and efferent arterioles' roles, and the function of Bowman's Capsule. The video also explains why fluid leaks out in the glomerulus but not in other arterioles.Leave feedback   https://cdn.kastatic.org/ka-youtube-converted/wWsdcfGta4k.mp4/wWsdcfGta4k.mp4 438 Structure and function of kidney https://www.khanacademy.org/science/grade-12-biology-snc-aligned/xa8ba3a087f1f5288:human-physiology/xa8ba3a087f1f5288:structure-and-function-of-kidney/e/renal-system---passage-2 2024-11-27T19:26:04.655876619Z Mini MCAT passage: Effects of pressure on GFR Renal system - Passage 2 Raja Narayan exercise https://www.khanacademy.org/science/health-and-medicine/human-anatomy-and-physiology/introduction-to-the-kidneys/v/changing-glomerular-filtration-rate 2023-08-17T23:33:36.770424498Z Changing glomerular filtration rate Get to know the renal system's glomerulus, the site of blood filtration. Learn how the diameter of arterioles influences the filtration rate and how substances like ions, amino acids, and glucose move through fenestrations into Bowman's space. Discover the impact of renal artery stenosis on filtration and the function of podocytes and tubule cells. Raja Narayan video https://cdn.kastatic.org/googleusercontent/gjPlmDRewRDHWHm1C5tbpmeZJ5iqG6GwcFAbqLlVZizDHmmNDUVzZ7u74aRld5FL26zZIQwyC2-fxaAmgGW7csvyaw Changing glomerular filtration rate Get to know the renal system's glomerulus, the site of blood filtration. Learn how the diameter of arterioles influences the filtration rate and how substances like ions, amino acids, and glucose move through fenestrations into Bowman's space. Discover the impact of renal artery stenosis on filtration and the function of podocytes and tubule cells. https://cdn.kastatic.org/ka-youtube-converted/x0pFo1RxTzM.mp4/x0pFo1RxTzM.mp4 265 Structure and function of kidney https://www.khanacademy.org/science/health-and-medicine/human-anatomy-and-physiology/introduction-to-the-kidneys/e/advanced-renal-quiz 2026-04-08T01:15:04.085520103Z Advanced urinary system quiz Advanced renal quiz Rishi exercise https://www.khanacademy.org/science/biology/human-biology/kidney-nephron/v/secondary-active-transport-in-the-nephron 2023-08-17T23:33:36.770424498Z Secondary active transport in the nephron This video provides an in-depth look at how the nephron, the functional unit of the kidney, actively pumps molecules against their concentration gradients. It details the process of secondary active transport, focusing on the roles of sodium-potassium pumps and cotransporters in reabsorbing essential molecules like glucose, salts, and calcium from the filtrate. Sal Khan video https://cdn.kastatic.org/googleusercontent/R2dIBg7SnqBckuT_wZwF35VVBHLFqaUaWD48O_t-93tHbI-LKSHq_I53eJ8cH8-4D16ixF1OOo0fqT-kUKiguHxE Secondary active transport in the nephron This video provides an in-depth look at how the nephron, the functional unit of the kidney, actively pumps molecules against their concentration gradients. It details the process of secondary active transport, focusing on the roles of sodium-potassium pumps and cotransporters in reabsorbing essential molecules like glucose, salts, and calcium from the filtrate. https://cdn.kastatic.org/ka-youtube-converted/czY5nyvZ7cU.mp4/czY5nyvZ7cU.mp4 853 Structure and function of kidney https://www.khanacademy.org/science/health-and-medicine/human-anatomy-and-physiology/introduction-to-the-kidneys/v/countercurrent-multiplication-in-the-kidney 2023-08-17T23:33:36.770424498Z Countercurrent multiplication in the kidney Explore the workings of the nephron, a key component of the renal system. Learn about the process of glomerular filtration, the role of the proximal convoluted tubule, the function of the loop of Henle, and the importance of the distal convoluted tubule. The video also highlights the concept of countercurrent multiplication, providing a comprehensive understanding of renal physiology. Raja Narayan video https://cdn.kastatic.org/googleusercontent/KsG8zhgyd6nRe8t-QrLoMQbE1dgRovMwuwHZHQVHORhe5TJcw6adeAT0Rd2y_8J5V7_9LKn6NCb4WyZ_aNXEvNki Countercurrent multiplication in the kidney Explore the workings of the nephron, a key component of the renal system. Learn about the process of glomerular filtration, the role of the proximal convoluted tubule, the function of the loop of Henle, and the importance of the distal convoluted tubule. The video also highlights the concept of countercurrent multiplication, providing a comprehensive understanding of renal physiology. https://cdn.kastatic.org/ka-youtube-converted/Vqce2dtg45U.mp4/Vqce2dtg45U.mp4 653 Structure and function of kidney 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/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 Structure and function of kidney https://www.khanacademy.org/science/health-and-medicine/circulatory-system/blood-pressure-control/v/aldosterone-and-adh 2020-07-15T21:03:14Z Aldosterone and ADH Find out how Aldosterone and ADH cause changes in volume and osmolarity. Rishi is a pediatric infectious disease physician and works at Khan Academy. Rishi Desai video https://cdn.kastatic.org/googleusercontent/AcUWPD6OwCmFiPGz7e9WBgKkoeUDMQroT0Xq8Cmh2Yxu8W0sNed320WeOF1hRGBOnr_5Cguj3MQOn3TIklLEFvI Aldosterone and ADH Find out how Aldosterone and ADH cause changes in volume and osmolarity. Rishi is a pediatric infectious disease physician and works at Khan Academy. https://cdn.kastatic.org/ka-youtube-converted/Z0XPMFL45oo.mp4/Z0XPMFL45oo.mp4 587 Structure and function of kidney https://www.khanacademy.org/science/up-biology-grade-11-revision-course-full-term/x01ceb15d0be61009:week-2/x01ceb15d0be61009:untitled-612/e/countercurrent-mechanism-and-micturition 2026-01-24T15:20:42.617490009Z Countercurrent mechanism and urination This exercise is on the countercurrent multiplication mechanism and micturition. 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