A Level Biology Revision "Gas Exchange in Insects"

You can find all my A Level Biology videos fully indexed at www.freescienc...
In this video, we look at gas exchange in insects. First we look at why larger organisms such as insects require a specialised gas exchange system. We then explore the structure of the insect gas exchange system, including the tracheae, tracheoles and spiracles. Finally, we look at how some insects have evolved mechanisms to increase the rate of gas exchange.
This video is aimed at the UK A Level Biology specifications. Students studying International A Level Biology will need to check their specification.
Image credits:
Amoeba
commons.wikime...
SmallRex, CC BY-SA 4.0 creativecommon..., via Wikimedia Commons
Mouse
commons.wikime...
Olympic National Park, Public domain, via Wikimedia Commons
Insect
commons.wikime...
Alandmanson, CC BY-SA 4.0 creativecommon..., via Wikimedia Commons
Bee
commons.wikime...
USGS Bee Inventory and Monitoring Lab from Beltsville, Maryland, USA, Public domain, via Wikimedia Commons
Spiracles
commons.wikime...
Geoff Gallice from Gainesville, FL, USA, CC BY 2.0 creativecommon..., via Wikimedia Commons
Hornet
commons.wikime...
Jerzy Strzelecki, CC BY-SA 3.0 creativecommon..., via Wikimedia Commons

[@aliyah8701]

i just want to say thank you so much! your videos helped me all the way through GCSEs to get grade 9s and you are now helping me through A levels, you truly are the best science teacher ever!

[@fatimaalamien8786]

Hi dr Donnelly , I was wondering if you could do a level videos on immunity ? Antigen representation , clonal selection ,clonal expansion , hemoral and cell mediated and things like that anytime soon b4 this session? thanks a lot for everything you do

[@Countdown420]

My favourite V-tuber😁

[@potati4097]

beautiful video 👍thnk you very much sir

[@rashidmohamed50]

Hi there. Love your work. I have a question regarding aluminum oxide. What chemicals or oxides except cryolite, can reduce aluminum oxide melting point if you heat them together in a crucible in a furnace? I know this auestion is not in par with the video above but I dont have your email address. I will appreciate your feedback

[@Elmartin1612]

Thanks to u sir I knew all the practicals and…. The marble chips one came out ! Thanks again for the help u are a hero in disguise

[@ShimmerRain6]

what's the marble chip one

[@zains1854]

hi sir, thanks for your all your help you legend

[@masteroogway6994]

Hi, do you think the exams will be easier this year, or are the grade boundaries going to be very low anyway?

[@theslashbro4474]

for the IGCSEs anyway, the grade boundaries for this year are 2019 > x > 2021 (greater than 2021, less than 2019)

[@Elmartin1612]

Hey dr Donnelly quick question would we have to learn more practicals like marble chips exct for rates of reactions and which from ur experience which practical will most likely come out ? Aqa chemistry rates of reaction

[@Freesciencelessons]

You should definitely learn the required practicals that are on the main focus playlists for 2022. Any other practicals that I mention in other videos are worth being aware of (as long as they are not in the "not going to be examined" list).

[@Elmartin1612]

@@Freesciencelessons ok so basically I have to check the required practicals from the advanced information right ?

[@Freesciencelessons]

I have made playlists covering the main focus topics in the advanced information, and these include the required practicals.

[@Elmartin1612]

@@Freesciencelessons ok and thanks again dr!

[@magidmukhtar2678]

for AS level cie what do we need to know about insect gas exchange?

[@ationomilly4398]

I've learnt something important

[@c0smicang3l94]

Hi Sir! My comment on the last video got deleted I think, it was a question asking about GCSEs. Do your playlists for 2022 Combined Science Higher cover EVERYTHING and every topic we need to know? Thank you so much if you can respond, love your content! 😆

[@sarah5138]

yh aqa

[@k3nz1e73]

Will you ever do the immune system please

[@Freesciencelessons]

Hi. I know that lots of students are waiting for that topic. I will be doing it in the very near future. I'm just making my way through the final AS chemistry topic (Equilibria). I have around five more videos to make on that and then I'll be going back to Biology and doing the Immune System.

[@MazP-xm3nk]

Hi, I used to watch ur videos to help me in my gcse 3 years ago, just wanted to know why don’t you use your face anymore? :)

[@OmniversalInsect]

He said it was becoming too tiring to record himself