A2 Biology - Selective reabsorption (OCR A Chapter 15.5)

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

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[muhammadjawad]

I have watched every single video and its absolutely amazing how everything is done win a proper order of OCR A book. I would deffinately recommend everyone every OCR A student to watch each video :)

[yohansa]

i hate this topic so much but you made it so understandable thank you so much for all your videos they’re so helpful and they’re the neatest ones I’ve seen by far :))) ur the reason I’ll pass a level biology in a few weeks💟

[seanhill]

I finished my A levels 5 years ago I'm just watching this to remind myself what I used to know 😅

[wylmzpp]

BioRach I love you so much! Especially because of all the broken up teaching, advanced info and whatnot - a real lifesaver. I have paper 1 and 2 this time 2 weeks!!

[jasminehaqq]

soo helpful, defo better than my teacher and rly articulate thanks so much :)

[hellershelsby]

Covering homeostasis in biology for my health and social care diploma. This video has absolutely saved my bacon so a huge THANKYOU for posting this. I've been away for 14 days & missed 3 full days of biology, so I'm having to teach myself what I've missed and this has been perfect for my assignment questions on nephron structure & ultra-filtration. Thanks again from Cornwall in the UK.

[zohamudassar]

hands down... will definetly recommend it to my friends!

[katysmith]

AMAZING video thank you so much so grateful for people like you who can actually teach well

[sophielee]

This is such a great well-explained video, so glad I found your channel! Perfect and so useful, thank you!

[viclate]

Thank you so much! I hope you know how helpful and valuable you are to us. You are the reason my grades have improved xx

[hbashir]

really great videos!!

really concise yet detailed video!!

[AA-fohw]

Omg Rach I’m so grateful for this video Thankyou so much it has helped me a lot, very Clear and simple.

[imaneelk]

You explain things so so well!!! Thank you so much

[theoneh]

Thank you, this was so clear. I do AQA but these vids are extremely helpful. Please keep up the great work!

[radika]

That was sooo important thank u for ur explanation. OMG that was amazing better than my teacher❤️

[eshalshoaib]

Amazing video! I love the representation and the vivid explanation. Thank you!

[bharathsomani]

tomorrow i have finals and i am sure i will definitely attempt this question if it occurs...thank u so much

[nataliepritchard]

These are really useful videos, thank you so much!

[hopepauline]

thank you so much this has helped summarise this topic.. could you please make a video for urine analysis and how guard cells work

[saramohsen]

Thaaank you ... I was almost lost ✨❤
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