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.
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
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.
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!
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.
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!!
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!
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)
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 :/
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 RUclips 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.
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
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
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??
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.
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.
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
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.
but how do the exchanges actually happen from a biology stance? what allows oxygen to pass but not let water or blood flow in/out? is there microscopic holes that are big enough for gasses but small enough to hold in/out liquid? how does co2 or other gasses escape the blood to lower the total gas content for more(a water glass can dissolve salt, but not once it reaches a maximum percentage, same with gases. and how is oxygen specifically filtered and gases regulated to not get too much or too little of o and other gasses. Sorry to hammer you but none of the videos i find on the subject go into these things, and only talk about these common sense basics.
I wish my professor would make me watch it....They included insect and fish physiology in this semester's human physiology and I'm trying to study for the exam in just 3 days! believe it can't get any worse....:P
Mr Pollock saving my A levels
preach
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.
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!!
FINALLLY A DUD THAT EXPLAINS IT PROPERLY WITH PROPER COMPARISON
this lesson was boring until I clicked on your video! Thank you so much. Your way of teaching is incredible
Your videos are great! They're clear to understand, without wasting time
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 :)
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.
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!
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!
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.
My biology teacher never thought me this,u area very awesome teacher
Phenomenal video for visualization
Thanks a lot- really helped me understand countercurrent flow better.
I wish my biology teacher could teach this well.
I CAN!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! #areyouserious #yeahboi
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!!
How come my teacher never explained it that well and yet instead of 7 lessons it took you 7 minutes?!
WOOOOW! this was such an amazing video thanks sooo much, so clearly explained and spoken so lovely. so informative thank u so much !
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!
You're a life saver.
Thank you ever so much, however, please do more exam paper tutorials!
KaBoom Cheers!
Why did I not subscribe sooner? Videos are brilliant, short and concise.
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)
This was one of the best explanation !! Thank u Mr Pollock :)
Still helping me even though I'm no longer in Kellett :)
Hi Mr Pollock!
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 :/
ruclips.net/video/89NCHxO55rY/видео.html
Important Larvae of all phylums
This was so helpful for my As bio exam this afternoon! Thank you!!
This is a super good video, clearly explained what I could not understand
very useful! This such simple video was better than my Biology teacher's teaching...
Thanks, I found this video helpful and easy to understand.
can we please have circulatory system, the arteries, veins..etc from aqa biology unit 2
thanks!!!!!!
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 RUclips 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
I love the way u explain things
This video was brief and well-explained thank you!
ruclips.net/video/89NCHxO55rY/видео.html
Important Larvae of all phylums
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
ruclips.net/video/89NCHxO55rY/видео.html
Important Larvae of all phylums
this video helped me out so much and i even do ocr!thank you so much!
Cheers!
Mr Pollock
does this still apply for the new spec?
very useful Mr Pollock, thank you very much
very simple and effective way to explain fish's gas exchange.
Thanks for the specialised characteristics is the exchange system
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 video. Very well explained.👍🏻
quick revision... now for some past paper questions! thanks
Unfortunately for GCSE students in 2018 this is no longer AS only
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??
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
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 :)
Very well explained🤗🤩
Thanks very much for good explanation. I will use it to teach my class
Best videos on youtube
Stylinson34 You're very kind! Glad they're helping you!
Cute & smart!
Great Video! 😁
Well explained thank you sir
Thankyou for explaining so simply made my life easier
great videos=liked, comment and now subscribed😀😊
Fabulous video, very well explained. Thank you.
fish has parallel flow or countercurrent flow or both?
Writing up labs. This is very useful. #reallygrateful
Can you explain what exactly is the gill arch?
2:53-3:35 the arrows are wrong on the right figure
ruclips.net/video/89NCHxO55rY/видео.html
Important Larvae of all phylums
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.
Where are its legs?
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
Thanks to you 🎉 I like it
This is in new spec for gcse bio thank u i thought i wouldnt ever understand this topic gcse paper 1 today😭
what so you mean by surface?
Good job sir!👍
very helpful😀😀😝thanks...
Mmm #hehehehe #goss #tuesday #yeahboi
Better than my lecturer😢
Love how he says for AS students and yet now it’s for GCSE students as well 🤦♀️
i have a qs in my mind what is the significance of counter current flow i mean why oxygen decrease
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 :)
Is it possible if you can do a video on gas exchange in an earthworm?
excellent teaching sir
Thank you so much, super helpful!
Thank you !
pollock... get it?
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! :)
It's ec 2 undrstnd d topic countercurrent flow after watching Ur video
your video saved my assignment
Clear thanks
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!
This saved me from being scolded by my science teacher XD
it was useful. thnx
lifesaver much useful
Nice
i get it now!!
I really understood it thanks
excellent,!,
Thank u sm
thanks I obtained A+ for the 3rd term examination for bio XD
but how do the exchanges actually happen from a biology stance? what allows oxygen to pass but not let water or blood flow in/out? is there microscopic holes that are big enough for gasses but small enough to hold in/out liquid? how does co2 or other gasses escape the blood to lower the total gas content for more(a water glass can dissolve salt, but not once it reaches a maximum percentage, same with gases. and how is oxygen specifically filtered and gases regulated to not get too much or too little of o and other gasses. Sorry to hammer you but none of the videos i find on the subject go into these things, and only talk about these common sense basics.
Rastaspects. Easy to understand
My teachers forcing me to watch this but thanks
+Chloe Scott I hope you find it useful! Could be worse...could be exam questions homework (like mine got!)
ME TOO
I wish my professor would make me watch it....They included insect and fish physiology in this semester's human physiology and I'm trying to study for the exam in just 3 days! believe it can't get any worse....:P
thank you
Super
ruclips.net/video/89NCHxO55rY/видео.html
Important Larvae of all phylums
Thanks dude
helpful...Saad
Thanjk yiu
this helps