Best A-Level revision channel ever. Thank you Mr Pollock!

@MrPollockBiology

9 жыл бұрын

***** Thanks!

I reckon I could learn my whole A Level Biology content off you!

@MrPollockBiology

8 жыл бұрын

+Caitlin Roper I try to help! Sadly I haven't covered the entire spec yet!

@khaledrehman6067

2 жыл бұрын

@@MrPollockBiology how about now

This is really helpful despite the fact i do the WJEC board, this pretty much explains its all, thank you Mr Pollock :)

Thank you so much for this video. I have was having a hard time visualising all the different parts of the insect but this video made it so easy to visualise and understand!

I thought an insect would have a large surface area compared to their volume??? and larger organisms have a small surface area to volume ratio.

@atifahidari9576

7 жыл бұрын

yeah that's what I thought

@jakepacey1591

7 жыл бұрын

That's correct

@rh8528

5 жыл бұрын

hence can lose water too easily

@NoOne-xu1hk

5 жыл бұрын

Compared to humans, it has a large SA:V, but compared to bacteria, which is probably the video prior to this, insects have a smaller SA:V

@user-kk4vi2jy6c

3 жыл бұрын

Well that only happens to microorganisms like amoeba and paramecium.

great video sir..

Thanks, good video, short and easy to understand. Thumbs up to you.

Impressive explanation, thank you!

These videos are a great help! Is this specific video still entirely relevant for the new spec? (Same with the other videos)

very informative!!!nice compiling...

This video is helping me soo much IMMA just go and watch your other gas exchange video about the fish again....

Pranam sir, 🙏 Nice video

This was helpful. I would like to see gaseous exchange in fish

Thank you!! Was really waiting for a video like this for the exam!

@MrPollockBiology

9 жыл бұрын

Jalal Asif Glad I could help!

Hi there, You're videos are great and very helpful in terms of knowing the content, however lots of students struggle with exam technique so could you please make more videos about how to structure answers to secure as many marks as possible

thank you sir; probably the best & easiest explanation on the subject; could you illustrate insect circulatory system in a video, please?

EXCELLENT!

That was so good! but please could you upload a little more detail of all those systems in insects!! :)

Any chance you could make videos for the WJEC spec. Love these videos in terms of content but they do all seem to be directed at AQA 👍🏼

Thanks for this video 🙂❤️ Love from Bangladesh ❤️

Thank you, this was very useful.

could you please do a video on the circulatory system from aqua in unit 2

awesome man!

I can only learn visually like this, thank you

@MrPollockBiology

8 жыл бұрын

+Chloe Scott You're most welcome. Glad it helped!

Very cool, thanks

thank you best of luck .

Really helpful, hate gas exchange, this helps me a lot :) #visuallearner

These videos are great and are the only hope for me getting an A! Just wondering though; how many videos are you away from completing the AS spec?

Could you do a video on meiosis/mitosis, and the causes of variation? Your videos have been so helpful :)

@MrPollockBiology

9 жыл бұрын

Will add it to the list!

Good job

Thank you.

Thank u Well explained

Does movement of the insects muscles create a mass movement of air in and out out of the trachea, thus speeding up gaseous exchange?

@MrPollockBiology

9 жыл бұрын

Yes the pumping of the abdomen does ventilate the insect quicker. I wouldn't say it speeds up gas exchange though...it's more to help the insect meet the increased oxygen demands of respiring tissues during exertion.

@mistarizla

9 жыл бұрын

ok thank you!

very good video, however you didn't explain about what happens during extreme muscle use (when the tracheal fluid is drawn into cells etc...)

Great channel!!😄

Is this information applicable to OCR?

Very useful video. However in the book it is in greater detail?

@MrPollockBiology

8 жыл бұрын

+MONTESH TV The book does go into a little more detail; but this video covers exactly what the AQA specification requires for A level. If you are studying a different course you may be expected to know a little more or a little less depending.

Please make a video on biology exam questions.....please?

I do WJEC Eduqas Is it quite the same

Can't use this for aqa as you don't cover anything about the diffusion gradient or, more importantly, the ends of tracheoles being filled with water...

insects have large S.A and small vol....

@NoOne-xu1hk

5 жыл бұрын

Compared to humans, it has a large SA:V, but compared to bacteria, which is probably the video prior to this, insects have a smaller SA:V

Do insects need to expel CO2?

Is there more oxygen available in water or air

Mr. Pollock... How do the insects not have bacteria growing like crazy in their wet breathing tubes????????? they are literally crawling through their own filth often... you would think infections would be killing them constantly.

PLEASE DO IMMUNOLOGY!!!!

فقط بالجراد هاي العمليه ؟

@noorbensaid6955

8 жыл бұрын

+akram لا في جميع الحشرات

Does the limitation of atmospheric oxygen to organism size also apply to vertebrates? And if so, is that why dinosaurs were so fucking big?

Cannot thank you enough

Thank you!

@MrPollockBiology

8 жыл бұрын

+Gaynelle Gilbride You're most welcome

Ur on my form5 bio textbook (qr code)

can i have information on reproduction of insects

Posted on my bday.. when i got xbox 360 :D

@Jay-jc2mj

4 жыл бұрын

The vid... Not the comment

Locusts have a large SA:V ratio not a small

@MrPollockBiology

9 жыл бұрын

Omar, in Biology we must think about SA:V as relative. Whilst I agree that insects will have a large sa:v relative to a human, they will have a small sa:v relative to a bacterium. In this video we are considering the implications of surface area and volume upon gas exchange. Any organism which has a dedicated gas exchange surface does so because it is unable to exchange directly with its environment, because the demands of its cells are too high. It therefore follows, that any organism with an internal exchange surface does so because it's SA:V is too small to allow exchange through its surface. I hope that helps

@omarahmed6731

9 жыл бұрын

Mr Pollock ahh yeah I understand thanks

hehe the video length is 4:20

*aqa

Why can’t we just breath through our skin … surface area

Siapa Dari buku teks biologi tingkatan 4 like

Takle lawan che

You say small surface area, large volume. I disagree with this because small animals have high surface area, low volume, ratio, which allows them to be without lungs. Where as an elephant has a large volume and lower SA and obviously needs lung