GCSE Biology Revision "Digestive Enzymes"

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GCSE workbooks www.amazon.co.uk/Dr-Shaun-Don...
School licenses from 40p per copy www.freesciencelessons.co.uk/...
In this video, we look at the specific enzymes found in the digestive system. We start by looking at the lock and key theory which explains why enzymes are specific. We then look at each of the three enzymes in digestion.
This video is based on the AQA spec. If you are following a different exam board then you should check your specification. The Amazon link above is an affiliate link. This provides a small commission which helps to support freesciencelessons. The cost remains the same to you. If you prefer not to use this, you can search Amazon for the Freesciencelessons workbooks.
Deliberate Thought by Kevin MacLeod is licensed under a Creative Commons Attribution licence (creativecommons.org/licenses/...)
Source: incompetech.com/music/royalty-...
Artist: incompetech.com/
Image credits:
Human digestive system Lozzaaa [Public domain], via Wikimedia Commons

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2 сен 2017

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Комментарии : 359

@soniachettra6860 6 лет назад

someone give this guy an award

@mariahussain3584 5 лет назад

Sonia Chettra he came to my school and he taught us

@Abigart69 4 года назад

Maria Hussain damn that’s incredible

@annamartinez7401 4 года назад

Noble Peace Prize: _award_

@DelayEdits 4 года назад

@@mariahussain3584 how would that even work? Does he cover the whole spec and just replace the teachers for like a week?

@sahidgelle1682 4 года назад

There’s no more space on his shelf of awardstaking up half of his wall

@AbdulRahman-pr4vo 3 года назад

This 4 minute video helped me more than my 40 minute class 😂

@ikithd7603 3 года назад

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@DB-xh4ru 2 года назад

Sure

@sensor3dd 2 года назад

Literally

@SigmaBengali Год назад

Best comment

@cooltricks666 Год назад

teachers just give the question, videos show and talk through it=that's why.

@senseispxctre 5 лет назад

I have an end of year biology exam later, if you are reading this then good luck on your exams too

@zBlxnks 3 года назад

thank you good sir hope you passed yours

@nuraishah9681 3 года назад

@@zBlxnks ill wait for your banner

@enteryournamehere4465 2 года назад

I'm doing one tomorrow Ik this was 2 years ago but yk

@danielharrison2586 Год назад

@@enteryournamehere4465 this was 8 months ago but ive got one tomorrow as well

@user-by8ch1kg9p Год назад

@@danielharrison2586 I have got one in an hour.

@bengraham824 6 лет назад

Ended up with an A* in Biology, an A in physics and an A in chemistry, thanks for the revision vids ❤️❤️❤️❤️❤️

@molly-mayjarvis3664 6 лет назад

how did you revise ????

@adriansecareanu2090 6 лет назад

I just did my mocks (Probably same as you) and I got 6 biology, 6 chemistry and 7 physics and I can say that making notes after watching videos, then highlighting them works, then doing the specimen papers given by your exam board.

@HH-fu1ol 6 лет назад

Adrian Secareanu lol doing same type of revision here

@naziaali5362 6 лет назад

Adrian Secareanu d

@at3036 6 лет назад

molly Jarvis, ben graham literally just told you how. by watching the videos

@ellabellaa5652 5 лет назад

I've learnt more in this 4min video than i have doing 2 hours of science today. Thank youuuu

@zygote4786 3 года назад

what did you get GCSEs?

@kimseokjin8756 Год назад

@@zygote4786 how about u? What did u get

@madina8074 3 месяца назад

The video is like 4 minutes long but i did over 2 pages of notes help. Love your videos, your the reason im not failing my sciences bro

@kiethlivingston5458 5 лет назад

Like if Shawn is better than any of your science teachers

@rahnaramzeen8756 5 лет назад

yeah he so is im listening to him right now

@Agnes329 5 лет назад

Shaun*

@jazzyed4463 4 года назад

I never knew his name was Shaun

@a1spanish630 2 года назад

My teacher just messes about on his computer

@KingPawin 3 месяца назад

@@a1spanish630 How's ur GCSE's

@Modle 6 лет назад

1:02 I’ve lived long enough to know that that’s pac man

@infinity_sh4816 3 года назад

truu lmaoo just think of it as pacc man I guess lool

@galaxyghost5572 3 года назад

Modle Gaming lmao sorry i can’t like you have 69 likes

@monki8761 6 лет назад

these videos are concise and perfectly on spec, ive had to learn the whole of the biology by myself (moved schools and they taught it the previous year). By using mostly your videos ive been getting 7s and 8s in my mocks, thank you!!

@at3036 6 лет назад

why don't teachers use videos of people who know what they are doing, we would plough through the syllabus much quicker and we can actually understand it better.

@ADEYENO 6 лет назад

A T303 my teacher made us watch this in class and it was so helpful :) this guy is a lifesaver for gcse

@bldsxcca 5 лет назад

My teacher doesnt teach us, just makes us watch him for the whole lesson lol

@natpat4094 3 года назад

@@bldsxcca i wanna do that too smh

@clairo.9619 3 года назад

@@bldsxcca I wish we did that lol

@loganc1634 2 года назад

@@bldsxcca lucky we spend 45mins on some shit i can't remember and doesn't help as much as this

@INeedGooderGrades 3 месяца назад

I barely paid attention in my biology/chemistry lessons because well you knwo they the "boring" branches of science I always used to get grade 7's in my physics and 4/5's in my chemistry and biology but using your vids I got a 8 in bio :) (solely watching your vids too and in my recent mock I picked myself a free grade 8 lol)

@Daniel-gn3yv 2 года назад

i have my bio exam tomorrow. The queen should give this precious man a knighthood. You are the true hero sir. You have saved countless lives. I thank you from the bottom of my heart.

@pastaslut 2 года назад

this guy is the literal director of all my flashcards

@elganm-r7327 6 лет назад

Great videos. these are much better than just reading the textbook. you cut the crap and get right to the point. Thankyou

@ADEYENO 6 лет назад

Elgan Mantonroseblade TRUE

@heatwave1923 5 лет назад

The one channel that can never die

@rizwanbaig3245 5 лет назад

Someone give this man an oscar

@k3nz1e73 3 года назад

Why an Oscar tho lol

@Viridian02 3 года назад

oscar???

@3dfilmsin2d29 Год назад

what I love about these, are they are straight go the point and yet so detailed with such little explanation. get this man an award

@progamingbrosyo5068 3 года назад

Did mocks before Xmas and got a 6 for my science paper I only revised for half a week by watching your vids. Doing end of year mocks now so hopefully these vids will help me out once again! Thanks Shawn

@Crashmat438 Год назад

Did it help?

@NeverBleak 3 года назад

bruh this is exactly what has been covered in my lesson, extremely satisfied :)

@CrappyEntertainment 2 года назад

2022 GCSE's anyone? Crazy times

@therealhouse6488 2 года назад

this man us carrying my pre mocks right now

@belleanndm 2 года назад

@theultimategamerg1rl167 2 года назад

Same goodluck guys I´m so scared

@captaantapaii8468 2 года назад

@ManiacalPenguin_ 2 года назад

Ye bro exam tomorrow, good luck man

@FreePalestine_79 Год назад

Honestly, Thank you for everything. I had no idea about the lock and key theory because my brain is a bit slow. I learn very slowly and science isn't my best subject despite wanting to pursue a science career. I love science and biology especially. You helped me gain confidence even though I had lost it all. Thank you.

@Freesciencelessons Год назад

Thank you for your comment, I appreciate it. I'm glad that my videos are helping and I wish you the best for your exams. I hope that you get the grades that you want.

@FreePalestine_79 Год назад

@@Freesciencelessons thank you

@FreePalestine_79 Год назад

@@Freesciencelessons I also wanted to ask like I said b4 I want a job in science do you have any advice?

@LiamBavingtonHodge 6 лет назад

You are a legend! Only plz return to the old music.

@kaiproductions7233 3 года назад

THANK YOU SO MUCH I`VE LEARNT MORE FROM YOU IN THE LAST 4 MINUTES THAN MY SCIENCE TEACHER IN 90 MINUTES

@robertbrodie9566 6 лет назад

1:02 that's not an enzyme that's Pacman

@gimmethepotato8024 5 лет назад

So true

@Venusx_x 5 лет назад

Omg 😂😂

@Meeky-rd2tp 5 лет назад

I dont know what i would do without this guy

@bryceyj1 3 месяца назад

Hey man! Thanks so much for making these videos for FREE. I’m taking my GCSEs next year and I’m curious to find out your opinion on the best way to study - whether it’s binge watching your videos or something. Can’t tell if I’m overly stressing in year 10, I’m trying my best to get A*s 😁

@blablablabla557 3 месяца назад

broo start revising slowly dont stress yourself too much but start revising im in year 11 literally cramming for my exams trust me you dont want to be me im literally regretting my life choices atm

@FailureRLBrothers 5 месяцев назад

2024 mocks, gcse ? !_!

@robyngold29 2 месяца назад

without this guy I never would have passed my mocks. This was way better than my current biology teacher. Thank you so much for your amazing work ☺

@cadgey1633 2 года назад

Love or hate this guys voice these videos are incredibly helpful :)

@prxcioussx Год назад

i have my bio paper 1 exam in less than 24 hours and I have a good feeling!! thank you sm sir :)

@205beats9 3 года назад

Got biology exam next wish me luck this man has saved me many a time

@naomihunter-chedick9768 6 лет назад

I'm only thirteen and this helped me a lot I hope it does more in the future 😁

@valkxx01 Год назад

@@shakeup1344 he is 16 right now so he will do his gcse's next year

@Viridian02 3 года назад

omg this is SOOO HELPFUL.... I've noticed a couple of your vids in the past, but never actually clicked on them. I can see I missed out on a lot!!!! Keep up the good work, and thank you so much.

@archierch0463 5 лет назад

I am using this when I am in S3 (14 years old) for biology test revision. This channel is great.

@soloyo3374 8 месяцев назад

u prolly have a job now

@Boumahra1975 5 лет назад

Sooo amazing. Please carry on the amazing work.

@SAM-cl2fi 3 года назад

Love the videos mate, much love ❤️❤️

@adama757 6 лет назад

new music? what kind of witchery is this??

@Freesciencelessons 6 лет назад

What do you think? I'm not sure whether to stick with it.

@adama757 6 лет назад

I prefer the older one, it kinda gave me a positive vibe

@tiaaxlaurenn3208 6 лет назад

I loved the old one

@brannocstevenson6971 6 лет назад

Freesciencelessons What is the name of the old music?

@rickyt8131 5 лет назад

@@brannocstevenson6971 I've been trying to find a credit from his old videos but he's only credited the new music (Deliberate Thought by MacLeod).

@OneOfYourFrenchGirIs 4 года назад

thank you for your videos, you help me to understand complicated topics 😁

@tandzilemaziya2972 2 года назад

He's the best.this is way better than reading the whole book or text

@simplecooking5507 4 года назад

Thank you so much! This is so helpful!

@nickhfraser 5 лет назад

Thanks so much, I didn't understand enzymes until I watched this video.

@kushia4002 6 лет назад

Thankkkkkkkks. Could u like go through past exam questions?

@janetmandume6074 Год назад

honestly this videos are better than my classes at school

@petrausifo5936 6 лет назад

I find this video very useful. Great video

@deadgirlwalking7027 3 года назад

Someone give this guy a nobel prize

@baghead3130 4 года назад

your are a legend dr shawn

@lamiyakhokon890 6 лет назад

Thanks a lot I like your videos a lot because they helped me.

@amywatson5080 6 лет назад

thanks for the videos 👍 very helpful

@t-7777 4 года назад

thank you so much you helped me pass my science exam

@shehlak 3 года назад

Amazing videos thank you so much.

@bethanystephenson1187 5 лет назад

Thank you so much for your videos their really useful

@jasminehearn7566 5 лет назад

so glad that i don't have to go through my 300 page science book and just listen instead XD

@spencersnursery1547 5 лет назад

thanks my test has just been made 50% easier.thanks im doing yr 9 gcse and this is the end of term test

@kaiproductions7233 3 года назад

Same your probably in year 11 now so can i have some tips my test is in 3 days

@eyeoftherish1162 2 года назад

how did ur gcse's go?

@circlele1160 2 месяца назад

Love the vids, thanks for the help

@jonathanskirton1676 6 лет назад

life saver for tomorrow, thanks!

@gimmethepotato8024 5 лет назад

Me too

@mqry_ii Год назад

i love this man

@kermitdefrog6666 2 года назад

i have my biology exam tomorrow this helped alot!

@kimberly_xox8554 2 года назад

good luck for anyone doing gcse tmr x

@freshpeanut4967 4 года назад

Watching while in quarantine

@solitairez3719 6 лет назад

so helpful!

@MaldMachine 5 лет назад

You saved me man thanks a lot

@gekotuneyuka 4 года назад

I have my Year 9 assesment and we are studying the GCSE course. I'm binging on him so badly XD.

@bashirmohamed163 4 года назад

very useful teaching thanks

@surayahhtaara983 6 лет назад

this really helps

@luxa1027 Год назад

Best science teacher fr

@benthompson9340 6 лет назад

this guy is the best

@thagasam3785 4 года назад

Very good explanation

@t___939 Год назад

where the 2023 students fr. Less than 2 months left before the biology exam!

@MullaBro Год назад

a few days ffs

@GOSS_3 Год назад

@@MullaBro Still aint done no revision but its fine biology ezpz anyway

@prxcioussx Год назад

tomorrow now.

@corneliusnowicki5363 3 года назад

I disable adblock just for this guy's videos

@talhahmayat5610 4 года назад

Whose watchin durin lockdown

@corbynbessonisahottie6060 4 года назад

yessirr

@rfrgr8917 4 года назад

me lmao

@dhairyagajera3729 3 года назад

Bonjour

@simakeyxox 2 года назад

Watching this rn before my biology exam

@Will-hh7zl 5 лет назад

learning more in a few hours than 4 years

@studywithrainbow4593 3 года назад

Sir, I love these videos! I just wanted to say a huge thank you as these videos are a massive help.

@willwlk 4 года назад

loving the videos, and the eyebrows

@adambeavis6708 3 года назад

how can 114 people dislike this guy

@SBegum-dn4mk 5 лет назад

wish u did edexcel, so hard to find short, informative and useful videos for edexcel

@Andrew-dh1ws 5 лет назад

Do you generally find the enzyme where the highest concentration of its substrate is? For instance you mentioned in the video at 3:13 that lipase is found in the pancreatic fluid and small intestine. Does the mean that most lipids are found in the small intestine and pancreas?

@Freesciencelessons 5 лет назад

No, all of the different food molecules are present at the start and then make their way through the digestive system. At each stage, different digestive enzymes act. This is often because a) They require specific conditions eg pH or b) They digest a molecule that is produced by an enzyme at an earlier stage. A good example of the second is proteins. In the stomach, they are digested into smaller fragments but later, in the small intestine, those smaller fragments are digested to amino acids. I hope that answers your question.

@clamantrabbit6485 2 года назад

bro got me all 9s in my sciences

@ReblazeGaming 5 лет назад

How'd the biology paper 1 go for you lot? I do aqa combined higher and it was alright

@samanthav2007 6 лет назад

do we have to know the structures though ? your vids are so helpful btw (:

@quranicaudios 9 месяцев назад

Thank you so much!!!!!

@zygote4786 3 года назад

LIFE SAVER.

@itsjustdai5509 3 года назад

Absolute smasher

@jae-ha 6 лет назад

Thanks Alot!!! 🙏

@zainabrahim6059 6 лет назад

I like this one

@salvax_x 5 лет назад

My Savior My teacher explains a whole chapter in one period like HOW? You cant understand a thing.

@Harmy147 2 года назад

In in year 7 and looking at this guys videos, i understand what he is saying and im writing everything he is saying, i hope i pass gcse...

@jsheiewur9 2 года назад

good luck u have a lot of time

@yorambo2857 2 года назад

if you understand this stuff in year 7 you will get all 9s. im year 11 watching this

@meliora99 2 года назад

@@yorambo2857 its pretty simple stuff

@samdoughty2481 2 года назад

good luck everyone it’s today😫

@afshanhaider1014 5 лет назад

You wonderful wonderful man

@jamesboyer6716 4 года назад

Biology mock on Friday woo

@Mustang-qr9ht 2 года назад

The day before my GCSE Biology Exam wish me luck. I'll tell you how it went 😂✌

@alexwilliamssales 2 года назад

cheers boss

@CrappyEntertainment 2 года назад

Who’s hear after only a 1 mark question on this…?

@vish_1538 6 лет назад

Binge watching all his vids

@Munnu_10 Год назад

0:00 - 0:14 hit different😮‍💨

@gurditdosanjh460 6 лет назад

Sir, what do you mean when you say "the bile emulsifies the fluid". It is at the time 3:44.

@gimmethepotato8024 5 лет назад

Lel

@fatmabatmaz2 3 года назад

It means the bile breaks down the fats into smaller droplets so the enzymes have a bigger surface area to work on. Although I know this is 2 years late xD

@istolejungkookbanana7937 4 года назад

Amazing I love it

@MintyMinho 3 года назад

hi army lool

@Aff_2207 3 года назад

my man hasnt moved from that spot for years...

@annafre1789 6 лет назад

hi I'm a little confused about what starch breaks down into. In my revision guide it says "maltose and other sugars" but in school we have learnt that starch is made up of glucose and you say simple sugars... which is right? I guess all of them but what should I use in my exam?

@Freesciencelessons 6 лет назад

Hi. Starch is a polymer of glucose but in the digestive system it is digested by amylase (a carbohydrase) into maltose (which is two glucose molecules bonded together). Later in the digestive system, the maltose is digested further by another enzyme to glucose. The AQA specification simply states that carbohydrases digest starch into "simple sugars". So I'd go with simple sugars if I was you. Hope that's ok.

@annafre1789 6 лет назад

Freesciencelessons yes thanks a lot!