Chapter 9 - Gas Exchange | Cambridge A-Level 9700 Biology

Based on the NEW! 2025-2027 syllabus
Cambridge International AS & A Levels Biology (9700)

Insta / Tiktok - @behlogy

[muhammadateeb]

Dear Ms Beh,

Just a quick note to express my gratitude for your fantastic biology videos on YouTube. Your clear explanations and passion for the subject make learning a joy. Thanks for making complex topics so accessible!

[alishamureed]

The description you gave for a bronchiole will definitely help me distinguish it better 🤣 And thanks for this great video ❤️

[mohammedsami]

The ARDS example made everything so clear !! Thanks for providing such a great explanation on this topic :)

[adibakhanaastha]

UR LITERALLY MY FAVORITE BIOLOGY TEACHER I WISH U WERE MY TEACHER FR alsoo could you upload 1.1a and the missing chapters cuz you're really carrying me thru AS

[fatimasaieed]

i don't know how to thank you Ms Beth! you have made bio so fun and understandable, hats off to you!!!

[viperoncrack]

I have AS exam in 2 weeks and this definitely helped

[benjiedjagli]

i had a really hard time to understand this chapter and i came across your video. you are a life saver. thank you!!!

[SaifAli-zmjs]

I wanna thank you for existing in such hard times I really like how you teach I hope I do well in my exams thanks a lot for being the most kindest teacher😭also BUTTHOLE is stuck in my head…

[dija]

i love ur vids sm !! ur getting so many ppls through AS this year. also i’d love if you’d do a live session and maybe solve past papers, have us ask you questions? before the may/june exams :, )

[zoe.nothando]

Thank you so much!! Your videos are helping me so much as I prepare for AS Bio at the end of the year. :)

[bilaldaboul]

Thank you so much for the micrographs !

[Fahimaalam]

Mam, can you say if its completely according to the syllabus 2025-2027??...by the way Thanks for helping me through the journey 💗

[mahmudulhasanhammad]

thysm, this vedio really explains a lot better than my teacher fr 😅

[flyingbeast]

Madam your videos are so helpful. Thanks a lot

[voyage-of-tranquility]

thank you so much for your determined work <3 I have a at 31:00, can't the answer be 3? aren't cell surface membranes just overall one component? why would we count it as 5?

[basilprivv]

Thank you so much ur channel is so helpful keep it up ❤❤

[mopo.diaries]

Thank you miss Beh!
but how can i differentiate between smooth muscle and elastic membranes in images?

[penelopekristan]

If the goblet cell secretes mucus, what’s the purpose of the mucus gland? Do they do the same thing, or are they different?

[mafutu]

Hi Ms! Thank you for the great video as always :) May I ask, should we ignore all past year questions related to lung diseases (e.g.emphysema, chronic bronchitis, COPD, lung cancer) as the smoking component has been removed from the syllabus? Thanks!

[aminahikram]

what is the difference between mucus glands and goblet cells?