In this video, we're going to be talking about the collecting duct. So the collecting duct is a tubule that further modifies the filtrate. If you look at the image here on the top right, basically at this point, the filtrate has gone through the entire renal tubule and it is exiting from the end of that distal tubule. And it is exiting into this long straight duct right there, and that is our collecting duct. So this is considered the final portion of the nephron. Now what's interesting is that each collecting duct actually collects filtrate from multiple nephrons. So if you look at our image here in the center, you can see that there is that collecting duct in the middle with that blue highlight behind it, and we have 2 nephrons here, 1 on the left and one on the right. And both of their distal tubules are emptying into that one collecting duct in the center. So each collecting duct is attached to multiple nephrons. Now each collecting duct consists of 2 structures. Each one has a cortical collecting duct which is simply the portion of the duct located in the renal cortex. And, then they each have a medullary collecting duct which is simply the portion of the duct located in the renal medulla. So those are nice and easy to remember. So, if we're looking at our image here, this portion of our collecting duct in this lightly colored region would be considered our cortical collecting duct. And then this portion of our collecting duct located in that renal pyramid would be considered our medullary collecting duct. Now, as these collecting ducts are coming down the renal pyramid and approaching the renal pelvis, they actually fuse into something called a papillary duct. Okay, so this right here is our papillary duct, And it's called the papillary duct because it's located at the papilla or the tip of that renal pyramid. And this is kind of hard to picture from our little cartoon here and most textbook images don't really show this either, but is kind of imagine each renal pyramid has 100 of collecting duct and about, you know, as they're coming down toward the tip of that renal pyramid, about 5 to 10 of them will fuse into one of these papillary ducts. And when filtrate reaches the end of that papillary duct, it is finally officially considered urine. We did it, guys. We finally made urine. So just to kind of put all of this anatomy together for you a little bit, what's happening here is we have our nephron located in the renal cortex. Filtrate is moving through the renal tubule, getting modified the entire time. It's moving through the collecting duct. It's still getting modified that entire time. The collecting duct is going down the renal pyramid toward the tip toward the papilla, and that filtrate is finally going to be coming out of that papillary duct. At that point, it is considered urine. So the urine is coming out of the tip, the papilla of that pyramid, it is emptying into a minor calyce which will then empty, empty into a major calyce, which will then empty into the renal pelvis, which we know is continuous with the ureter. And so urine will travel down the ureter and then enter the urinary bladder. But just to kind of put all that together for you. Alright. So that is our collecting duct and I will see you guys in our next one. Bye-bye.
Table of contents
- 1. Introduction to Anatomy & Physiology5h 40m
- What is Anatomy & Physiology?20m
- Levels of Organization13m
- Variation in Anatomy & Physiology12m
- Introduction to Organ Systems27m
- Homeostasis9m
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- Simple Epithelial Tissues1h 2m
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- Introduction to Muscle Tissue7m
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- 5. Integumentary System2h 20m
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- An Introduction to Bone and Skeletal Tissue18m
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- 7. The Skeletal System2h 35m
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- 12. The Central Nervous System1h 6m
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- Introduction to the Peripheral Nervous System5m
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- 14. The Autonomic Nervous System1h 38m
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- 16. The Endocrine System2h 48m
- 17. The Blood1h 22m
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- 19. The Blood Vessels3h 35m
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- Introduction to the Immune System10m
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- 22. The Respiratory System3h 20m
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- Introduction to Cellular Respiration22m
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- Cellular Respiration: Krebs Cycle16m
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- Review of Aerobic Cellular Respiration18m
- Fermentation & Anaerobic Respiration23m
- Gluconeogenesis16m
- Fatty Acid Oxidation20m
- Amino Acid Oxidation17m
- 25. The Urinary System2h 39m
- 26. Fluid and Electrolyte Balance, Acid Base Balance Coming soon
- 27. The Reproductive System2h 5m
- 28. Human Development1h 21m
- 29. Heredity Coming soon
25. The Urinary System
The Nephron
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