Your explanation of counter current flow is so helpful. Before when I answered questions on it, id just regurgitate the text book answer without understanding it
My teacher gave homework yet she never taught the class what we needed to know. Thank you so much! This, as well as your other videos, was super super helpful.
This is really helpful. I was struggling with this and only know base on the lesson but having this video up really help me understand better. Thank you.
Great info. As a physician, this is very interesting. When teaching physiology to medical school students, using comparative anatomy, it is very important to know evolution. One thing i think I frequently use when teaching gas exchange, is that the surface area in humans, a 70 Kg adult is equivalent to the surface area of a basketball court! - The Chinese ( who else would have the patience🙄) did that manually in the 1960’s. As you know O2 saturation in Room Air is 21%. O2 seats in humans are expected to be above 90%. The O2 content in water is much lower, so either the efficiency of gills oils much higher, or the oxygen binding system is much more effective. From what I remember most fish have Fe based. In humans during fetal development, the O2 saturation is 20% when they have fetal hemoglobin. This is more than sufficient to maintain normal development. DARPA & US NAVY have developed fluorine based fluids to fill human lungs which can maintain up to 6 h of oxygenation. Fluorine binds 5 oxygen molecules and the alveoli are filled with fluid. A very unpleasant process where one feels they are drowning, but when they calm down, all is normal. Moving the diaphragm causes turbulence which brings new molecules of fluosyl (R) in contact with the outermost part of the alveolus. From the time I was peripherally involved with this research in the early 90’s I believe they have found a way to replenish the O2 on the fluosyl (R) by gas permeable cartridges& O2 tanks, therefore extending the duration of the dive. Would love to correspond with you & exchange some ideas.
This was really helpful to watch after having a hard time understanding countercurrent exchange during my class lecture. I appreciate the simple diagram showing opposite blood and water flow. Thanks!
thank you so much!! i've been trying to understand countercurrent flow for AGES and reading about it just confused me more, but when you showed that diagram it immediately clicked!!! thank you for saving my ATAR!!
My teacher just gave up one day, played one of your videos, leaned back and scrolled through Facebook, and I honestly learnt more in 7 minutes than I would have in 7 lessons :/
Is there error in picture @3:00 ? The arrows of the water flow and blood flow seem to be incorrect on the far right picture. Let me know if I am off somewhere. Very helpful video and I enjoyed and understood much!
weird question but what if the fish was out in say a space station, could the fish breathe as there wouldnt be gravity and so the fish's gills wouldnt compress like they would on the ground? so you could have a fish floating around the space station without it dying
beastlyjedi You're right…that is a weird question! And one that I'm unable to answer. One day, when I'm a UA-cam multimillionaire, I will invest time and money into discovering whether this is true.
Mr Pollock make sure to give me a shout when you achieve this! and thank you for the videos as well as they are helping me so much for my upcoming exam!!
I think another reason-apart from the collapsing gill filaments-that fish can't breathe in air, is that more oxygen can more easily diffuse across the membrane when in solution such as water. It doesn't diffuse very well like that as a gas, so the gills would need to be very moist anyway. I think this is just unfeasible for the amounts fish would need to get into their blood.
I was wondering if you have the rest of unit 2 videos coming up, things such as Dna, classification, haemoglobin, Dna replication, the circulatory system (arteries, arterioles and veins)
Such a great video!. Got a question though. What happens to other gases also dissolved in the water, like nitrogen... do they also get into the fish's lamella?
+Javi yeah but I think it just doesn't get used during the counter current flow system and just flows out of the gills as it does not need nitrogen or other gases for respiration.
How do fish manipulate pressure changes in their mouth though? If it is lengthy to explain, can you link me to an article or something that can explain? Thanks
This is so helpful thank you, though i'm doing OCR and I think we do need to know about the pressure changes in the mouth and opercular cavity could someone explain??
Best A-level Biology videos on the internet. Can you make a video on the 25 mark essay for BIOL5? you could go through some examples of good essays if you want. :D
wow that was quick! awesome news i need something like that because there's not much in the textbooks about the 25 marker. hopefully it will be a mark grabber for me.
So would it be correct in saying that if a question asked me to explain counter con current flow to say " highly oxygenated water meets less oxygenated blood creating and maintaining a constant concentration gradient across the whole lamellae" ? Thanks
Great videos!! Really helpful especially now since exams are coming up! :) I was wondering if you could also make a video on Protein Synthesis? I find that topic really confusing :s
I have a possibly dumb question (sorry not a bio student here Haha!) On the counter current flow, how did the blood on the left side became more oxygenated than on the right side? Because for what i have know; as blood travels, its oxygen get distributed to other tissues thus, having a lesser amount of oxygenation the more the blood travels.
Mr Pollock saving my A levels
preach
FINALLLY A DUD THAT EXPLAINS IT PROPERLY WITH PROPER COMPARISON
Your explanation of counter current flow is so helpful. Before when I answered questions on it, id just regurgitate the text book answer without understanding it
Thanks :)
How come my teacher never explained it that well and yet instead of 7 lessons it took you 7 minutes?!
Your videos are helping me so much with my revision! They’re so clear and well laid out. YOU’RE GETTING ME THROUGH MY A LEVELS!!
Your videos are great! They're clear to understand, without wasting time
this lesson was boring until I clicked on your video! Thank you so much. Your way of teaching is incredible
My teacher gave homework yet she never taught the class what we needed to know. Thank you so much! This, as well as your other videos, was super super helpful.
Still helping me even though I'm no longer in Kellett :)
Hi Mr Pollock!
This is really helpful. I was struggling with this and only know base on the lesson but having this video up really help me understand better. Thank you.
I wish my biology teacher could teach this well.
I CAN!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! #areyouserious #yeahboi
Great info. As a physician, this is very interesting. When teaching physiology to medical school students, using comparative anatomy, it is very important to know evolution. One thing i think I frequently use when teaching gas exchange, is that the surface area in humans, a 70 Kg adult is equivalent to the surface area of a basketball court! - The Chinese ( who else would have the patience🙄) did that manually in the 1960’s. As you know O2 saturation in Room Air is 21%. O2 seats in humans are expected to be above 90%.
The O2 content in water is much lower, so either the efficiency of gills oils much higher, or the oxygen binding system is much more effective. From what I remember most fish have Fe based. In humans during fetal development, the O2 saturation is 20% when they have fetal hemoglobin. This is more than sufficient to maintain normal development.
DARPA & US NAVY have developed fluorine based fluids to fill human lungs which can maintain up to 6 h of oxygenation. Fluorine binds 5 oxygen molecules and the alveoli are filled with fluid. A very unpleasant process where one feels they are drowning, but when they calm down, all is normal. Moving the diaphragm causes turbulence which brings new molecules of fluosyl (R) in contact with the outermost part of the alveolus.
From the time I was peripherally involved with this research in the early 90’s I believe they have found a way to replenish the O2 on the fluosyl (R) by gas permeable cartridges& O2 tanks, therefore extending the duration of the dive. Would love to correspond with you & exchange some ideas.
online a levels would be so hard without you so thank you, ur summaries are amazing!!!!!
Thank you so much! I could not understand how countercurrent flow works but your video and explanation helped me tremendeously!
My biology teacher never thought me this,u area very awesome teacher
Phenomenal video for visualization
This was really helpful to watch after having a hard time understanding countercurrent exchange during my class lecture. I appreciate the simple diagram showing opposite blood and water flow. Thanks!
+Haley Witt No probs; glad I could help!
Thanks a lot- really helped me understand countercurrent flow better.
thank you so much!! i've been trying to understand countercurrent flow for AGES and reading about it just confused me more, but when you showed that diagram it immediately clicked!!! thank you for saving my ATAR!!
You're a life saver.
Thank you ever so much, however, please do more exam paper tutorials!
KaBoom Cheers!
Loved how clearly you explained this, I really appreciate it. Thanks, and please continue to make these awesome videos! :)
WOOOOW! this was such an amazing video thanks sooo much, so clearly explained and spoken so lovely. so informative thank u so much !
I love the way u explain things
Thanks, I found this video helpful and easy to understand.
quick revision... now for some past paper questions! thanks
Why did I not subscribe sooner? Videos are brilliant, short and concise.
This video was brief and well-explained thank you!
ua-cam.com/video/89NCHxO55rY/v-deo.html
Important Larvae of all phylums
Thanks very much for good explanation. I will use it to teach my class
This is a super good video, clearly explained what I could not understand
Thanks for the specialised characteristics is the exchange system
This was one of the best explanation !! Thank u Mr Pollock :)
this video helped me out so much and i even do ocr!thank you so much!
Cheers!
Mr Pollock
This was so helpful for my As bio exam this afternoon! Thank you!!
very useful Mr Pollock, thank you very much
very useful! This such simple video was better than my Biology teacher's teaching...
My teacher just gave up one day, played one of your videos, leaned back and scrolled through Facebook, and I honestly learnt more in 7 minutes than I would have in 7 lessons :/
ua-cam.com/video/89NCHxO55rY/v-deo.html
Important Larvae of all phylums
very simple and effective way to explain fish's gas exchange.
Very well explained🤗🤩
Love how he says for AS students and yet now it’s for GCSE students as well 🤦♀️
Great video. Very well explained.👍🏻
Unfortunately for GCSE students in 2018 this is no longer AS only
Well explained thank you sir
Is there error in picture @3:00 ? The arrows of the water flow and blood flow seem to be incorrect on the far right picture. Let me know if I am off somewhere. Very helpful video and I enjoyed and understood much!
You may have a point there! Well spotted...this is why I shouldn't borrow images from google!
watching this after having fun dissecting a fish
+gamesquestjames Nice!
Cool. I am planning on dissecting a fish myself.
i want someone to disect me
@@nishalfishal Lmaooo
Your videos are brilliant! Can you please go over mitosis and semiconservative replication and classification using DNA / courtship behaviour :)
Nice, but you didn't explain much about the other parts of the raspitory system or how the blood delivers oxygen to different parts of the body
Cute & smart!
Great Video! 😁
Thankyou for explaining so simply made my life easier
Fabulous video, very well explained. Thank you.
Writing up labs. This is very useful. #reallygrateful
Better than my lecturer😢
Mmm #hehehehe #goss #tuesday #yeahboi
can we please have circulatory system, the arteries, veins..etc from aqa biology unit 2
thanks!!!!!!
This is in new spec for gcse bio thank u i thought i wouldnt ever understand this topic gcse paper 1 today😭
weird question but what if the fish was out in say a space station, could the fish breathe as there wouldnt be gravity and so the fish's gills wouldnt compress like they would on the ground? so you could have a fish floating around the space station without it dying
beastlyjedi You're right…that is a weird question! And one that I'm unable to answer. One day, when I'm a UA-cam multimillionaire, I will invest time and money into discovering whether this is true.
Mr Pollock make sure to give me a shout when you achieve this! and thank you for the videos as well as they are helping me so much for my upcoming exam!!
I think another reason-apart from the collapsing gill filaments-that fish can't breathe in air, is that more oxygen can more easily diffuse across the membrane when in solution such as water. It doesn't diffuse very well like that as a gas, so the gills would need to be very moist anyway. I think this is just unfeasible for the amounts fish would need to get into their blood.
isn't space a vacuum? doesn't that mean there is no oxygen. I think the fish would freeze as well. don't know for sure though
Zak Milson he said in a space station, so there will be oxygen inside
Thank you !
Thanks to you 🎉 I like it
Best videos on youtube
Stylinson34 You're very kind! Glad they're helping you!
great videos=liked, comment and now subscribed😀😊
Nice
I was wondering if you have the rest of unit 2 videos coming up, things such as Dna, classification, haemoglobin, Dna replication, the circulatory system (arteries, arterioles and veins)
very helpful😀😀😝thanks...
lifesaver much useful
Clear thanks
Thank you so much, super helpful!
I really understood it thanks
does this still apply for the new spec?
Thank u sm
Where are its legs?
i get it now!!
excellent teaching sir
Good job sir!👍
excellent,!,
Such a great video!. Got a question though. What happens to other gases also dissolved in the water, like nitrogen... do they also get into the fish's lamella?
+Javi yeah but I think it just doesn't get used during the counter current flow system and just flows out of the gills as it does not need nitrogen or other gases for respiration.
Thanks for answering :)
How do fish manipulate pressure changes in their mouth though? If it is lengthy to explain, can you link me to an article or something that can explain? Thanks
ua-cam.com/video/89NCHxO55rY/v-deo.html
Important Larvae of all phylums
it was useful. thnx
It's ec 2 undrstnd d topic countercurrent flow after watching Ur video
your video saved my assignment
Really good videos, they're extremely helpful!!!! If possible could you make a video on the different immunological techniques? :)
Shaleen A Thanks for the kind words; doubt I'll manage any immunology vids before the exam I'm afraid!
Mr Pollock it's okay I understand :)
This is so helpful thank you, though i'm doing OCR and I think we do need to know about the pressure changes in the mouth and opercular cavity could someone explain??
Thank you
Best A-level Biology videos on the internet. Can you make a video on the 25 mark essay for BIOL5? you could go through some examples of good essays if you want. :D
A unit 5 essay mini-series may be in the works... Keep your eyes peeled.
wow that was quick! awesome news i need something like that because there's not much in the textbooks about the 25 marker. hopefully it will be a mark grabber for me.
Hey look...some essay videos appeared on my channel!
thanks I obtained A+ for the 3rd term examination for bio XD
Rastaspects. Easy to understand
This saved me from being scolded by my science teacher XD
So would it be correct in saying that if a question asked me to explain counter con current flow to say " highly oxygenated water meets less oxygenated blood creating and maintaining a constant concentration gradient across the whole lamellae" ? Thanks
Great videos!! Really helpful especially now since exams are coming up! :) I was wondering if you could also make a video on Protein Synthesis? I find that topic really confusing :s
Will put protein synthesis on the list...thanks for the kind words
Thank you so much! :)
what so you mean by surface?
I have a possibly dumb question (sorry not a bio student here Haha!)
On the counter current flow, how did the blood on the left side became more oxygenated than on the right side?
Because for what i have know; as blood travels, its oxygen get distributed to other tissues thus, having a lesser amount of oxygenation the more the blood travels.
helpful...Saad
Sorry am floating I don't get it everything is perfect but I think I need my teacher for more explanation
Super
ua-cam.com/video/89NCHxO55rY/v-deo.html
Important Larvae of all phylums
Thanjk yiu
pollock... get it?
fish has parallel flow or countercurrent flow or both?
Can you explain what exactly is the gill arch?
Thanks dude
perfect.
this helps
i just want to know the reaction that happens when the oxygen goes from the water to the gill
Uhh thank you!!!!