1 / 14

Kidney in Detail: Understanding Excretion and Function of Nephrons

Learn all about the intricate process of excretion by the kidneys, including filtration and reabsorption in nephrons and why nitrogenous waste must be excreted. Explore how the kidneys regulate water concentration and maintain internal balance. Dive into the world of renal anatomy and physiology in this informative guide.

cannonh
Download Presentation

Kidney in Detail: Understanding Excretion and Function of Nephrons

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Kidney in Detail www.assignmentpoint.com

  2. Excretion by the Kidney • Urea -nitrogenous waste -made by liver -excess amino acids in blood -toxic • Why must nitrogenous waste be excreted? www.assignmentpoint.com

  3. 1 – Filtration by the Kidney • Supplied with blood from renal artery • Inside it splits into many fine capillaries • Each capillary supplies blood to hundreds of thousands of tiny filtration units called nephrons Renal artery Lets have a look at a nephron!!! Renal vein Ureter www.assignmentpoint.com

  4. www.assignmentpoint.com

  5. www.assignmentpoint.com

  6. Blood from renal artery enters wide capillary • Glomerulus brings a large surface area of blood capillaries in close contact with Bowman’s capsule 2. Liquid filtered from blood under pressure (filtration) • Glomerular filtrate produced containing: -water -glucose -salts -urea (Protein molecules and red blood cells do not pass into tubule as they are TOO BIG!!!!) Blood travels through narrow capillary towards renal vein Filtration Glomerular filtrate www.assignmentpoint.com

  7. Think… • Which feature of the glomerulus helps the process of filtration? • Which 4 components of unfiltered blood appear in the glomerular filtrate? • Why do blood cells and protein molecules not appear in the glomerular filtrate? www.assignmentpoint.com

  8. Key Words!! Nephron: structure in the kidney that acts as a microscopic filtration unit Glomerulus: dense mass of very fine blood capillaries at the nephron that act as a filter Bowman’s capusle: cup-shaped part of the nephron that holds a glomerulus and collects the products of filtration from it Glomerular filtrate: liquid removed from the blood by filtration in the kidney www.assignmentpoint.com

  9. 2 – Reabsorption by the Kidney • Once the main components of glomerulur filtrate enter the bloodstream -they are no longer in bloodstream • If nothing more happened in the nephron then all the useful stuff would be lost in the urine! • Therefore, glucose, water and some salts need to be reabsorbed! www.assignmentpoint.com

  10. More water reabsorbed Glucose reabsorbed Final urine containing: -excess water -unneeded salts -waste urea Variable amounts of water and salts reabsorbed and filtrate gradually turning into urine www.assignmentpoint.com

  11. Think…. • Which three components of the glomerular filtrate are reabsorbed? • Why is it important for these to be reabsorbed? • Which substances are present in the final urine? www.assignmentpoint.com

  12. 2 – Controlling Water Concentration • Blood -important part of internal environment -constantly changing water concentration -e.g. exercising drinking lots of water • The body uses negative feedback control to regulate water content of the blood www.assignmentpoint.com

  13. How does it work? www.assignmentpoint.com

  14. Control of Water animation www.assignmentpoint.com

More Related