Selective reabsorption is a crucial function of the nephron/kidney as it takes the useful substances back into the body, which would otherwise be lost and wasted through urine excretion. In this video we will look at the details of this process, seeing what substances are reabsorbed by which structure and by which mechanism.

Additional study/exam tips:
- Hypertonic/Isotonic: Remember these words are comparative! When we say that the filtrate at the bottom of the loop of Henle is hypertonic, it means that the filtrate has a higher salt concentration than the tissue fluid around the tubule. Avoid just saying "filtrate has a higher salt concentration"!
- Always say by which transport mechanism the substance is moved across the membrane/tubule wall: Diffusion, osmosis or active transport

Please subscribe for more content and comment below to let me know what you think! :)

Facebook: BioRach - A-level Biology Online
  / biorachproject  

Twitter: @BioRachProject
https://twitter.com/BioRachProject?la...

Background music:
Land on the Golden Gate by Chris Zabriskie is licensed under a Creative Commons Attribution licence (https://creativecommons.org/licenses/...)
Source: http://chriszabriskie.com/stuntisland/
Artist: http://chriszabriskie.com/