Digestion By Enzymes | Organic Chemistry | Chemistry | FuseSchool

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Digestion By Enzymes | Organic Chemistry | Chemistry | FuseSchool

Digestion By Enzymes | Organic Chemistry | Chemistry | FuseSchool

Digestion By Enzymes | Organic Chemistry | Chemistry | FuseSchool

In this video we examine the process of digesting our food. We shall see how biological catalysts called enzymes break these food molecules apart and why they are necessary.

Think of our food molecules as a train of trucks all coupled together. Digestion disconnects the trucks so we can re-assemble them in our own way.

The breaking takes place by hydrolysis โ€“ a reaction where water is added and breaks the link. Letโ€™s look at the simplified reaction for each of the foods we eat:

Starch is a polymer of simple sugars which are joined by a glycosidic link Cโ€“O-C . When water is added the link breaks.

Proteins are polymers of amino acids are joined in by the amide C-O-N-C link. Water breaks the chain into separate amino acids.

The nucleotides in the DNA double helix are joined by phosphate groups. Water breaks the link.

In the same way fats are hydrolysed into glycerol and fatty acid, such as stearic acid used in soap making! Water breaks the link

Once our food is digested into monomers the molecules are small enough to get though the walls of our gut and into our blood ready to be used as fuel (sugars, fats and oils ) or to build up our own proteins and DNA.

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Author Avatar


  • Posted on May 19, 2015 at 16:38 pm

    Excellent description of how enzymes work. Thank you.

  • Posted on Jan 24, 2016 at 02:09 am

    Fascinating.. I have always have been curious how it all works. Thank you as well.

  • Posted on Feb 04, 2016 at 07:46 am

    Great Vid Guys Keep It Up ๐Ÿ™‚

  • Posted on Mar 26, 2016 at 23:24 pm

    Very good!

  • Posted on Apr 25, 2016 at 17:44 pm

    Now I won't Fail ๐Ÿ™‚

  • Posted on Nov 18, 2016 at 14:23 pm


  • Posted on Feb 07, 2017 at 22:04 pm


  • Posted on May 28, 2017 at 17:38 pm

    Pepsin is probably the anomaly as it doesn't follow the 'ase' rule. Really good video though.

  • Posted on Jun 01, 2017 at 06:13 am

    Great vid๐Ÿค™

  • Posted on Oct 11, 2017 at 07:39 am

    What can you do if your body isn't producing these enzymes like it should?

  • Posted on Oct 16, 2017 at 13:56 pm

    excellent description. thank you

  • Posted on Feb 01, 2018 at 02:06 am

    Note: the roughage is also called villi

  • Posted on Feb 01, 2018 at 02:07 am

    Ptyalin is in the mouth while Amylasin is in the small intestine and they both break down carbohydrates.. Now that's the difference

  • Posted on Feb 23, 2018 at 02:01 am

    Still dont get it chemical reaction are used to combine two substance to produce new substance but how chemical reaction occur in digestion when they are used to breakdown foods? Answer me pls

  • Posted on Sep 15, 2018 at 17:25 pm

    Great video

  • Posted on Oct 22, 2018 at 07:58 am

    My review for the term exams

  • Posted on Mar 21, 2019 at 07:14 am

    Thank you so much! I'm sure to pass my biology test today!!โคโค๐Ÿ‘

  • Posted on Mar 28, 2019 at 11:54 am


  • Posted on Mar 31, 2019 at 09:39 am

    What about the enzymes "Trypin" and "Pepsin"? They clearly don't end in 'ase'.

  • Posted on May 12, 2019 at 22:24 pm

    very useful! Thank you very much!

  • Posted on Sep 14, 2019 at 20:27 pm

    Thanks very much for the video

  • Posted on Jan 05, 2020 at 13:44 pm


  • Posted on Mar 26, 2020 at 22:58 pm

    Thank you for a great video!

  • Posted on Apr 19, 2020 at 15:55 pm

    Is this video okay to watch for 8th graders or am I just behind on my studies..? T^T

  • Posted on Apr 30, 2020 at 14:26 pm

    Help my goldfish is trying to kill me

  • Posted on Apr 30, 2020 at 14:26 pm

    He came from the abyss

  • Posted on May 18, 2020 at 00:37 am

    Nice video ๐Ÿ˜›

  • Posted on May 18, 2020 at 00:38 am

    9L Gang

  • Posted on Jul 09, 2020 at 15:08 pm

    I just wanna say Thanku a zillion times ๐Ÿ˜˜

  • Posted on Oct 07, 2020 at 12:27 pm

    faltu video waste of time

  • Posted on Oct 13, 2020 at 16:38 pm

    What a vid.Never seen so much explanation.thnxs for helping me passing

  • Posted on Oct 14, 2020 at 15:51 pm

    I will not fail now… ๐Ÿ˜Š๐Ÿ˜Š

  • Posted on Oct 22, 2020 at 19:00 pm

    Is there a transcript?

  • Posted on Oct 27, 2020 at 01:36 am

    how tf is this supposed to help me

  • Posted on Oct 29, 2020 at 08:11 am

    โค๏ธgreat video โค๏ธ

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