The Digestive System

May 08, 2023

Digestion

Digestion is the process of breaking down large, insoluble molecules in food into smaller, soluble molecules that can be absorbed into the bloodstream. These small soluble molecules are used by cells for the release of energy, or to build other molecules.

The digestive system is an example of an organ system in which several organs work together to digest and absorb food.

Tissues & organs of the human digestive system

The organs of the digestive system work together to digest and absorb food

Structure	Function
Mouth	Food is ingested here and the teeth break it apart during mechanical digestion, increasing its surface area for chemical digestion
Salivary glands	Saliva is secreted into the mouth The enzyme amylase in saliva begins to digest starch into maltose
Oesophagus	This tube connects the mouth to the stomach Contractions of the walls of the oesophagus force the food downwards; this is peristalsis
Stomach	Churning of the muscular stomach walls continues the process of mechanical digestion Protease enzymes begin protein digestion Hydrochloric acid provides a suitable pH for the enzymes and also destroys any pathogens in food
Liver	Bile is produced here; it aids the digestion of fats, as well as neutralising stomach acid as it exits the stomach
Gall bladder	Bile is stored here before being released into the duodenum via the bile duct
Pancreas	Amylase, protease and lipase enzymes are produced here before being released into the small intestine
Small intestine	The acidic stomach contents are neutralised by bile and become slightly alkaline Enzymes complete chemical digestion Food and water are absorbed into the blood via villi
Large intestine	Remaining water is absorbed from food into the blood, and the solid waste left behind in the colon forms faeces
Rectum	Faeces are stored here prior to egestion
Anus	Faeces leave the body via the anus; this is egestion

The digestive system is a series of organs working together to break down and absorb food

The importance of bacteria in digestion

The large intestine is home to hundreds of species of bacteria
These bacteria form a microbial ecosystem that play an essential role in human digestion of food by, e.g.:
- breaking down substances we can’t digest
- supplying essential nutrients
- providing competition with any harmful bacteria to restrict their growth

WHAT OUR CUSTOMERS ARE SAYING ABOUT US

Sneha - London

My son worked with Katie Jackson for his GCSE Combined Science ( Biology, Chemistry, and Physics) and it made a real difference. The lessons were engaging and helped him get much more confident with tricky topics and exam-style questions. Katie was patient, encouraging, and explained things clearly, which really suited his learning style. He went on to achieve a grade 7, and we’re very pleased with his progress. It was a really positive and supportive experience. I highly recommend Katie to anyone looking for Science teacher.

07/10/2025

Jesse - Colchecter

Dr Huma is a very good Science teacher, She helped me understand tough topics which was very beneficial for me and helped me get a good grade. I got 7,7 in my combined Science GCSE final exams. I would highly recommend her to everyone who is looking for a Science tutor. Thank you Dr Huma Idrees.

25/08/2025

Jesse - Colchester

Ms Dajana Dala is a very good Maths teacher, She helped me understand tough topics which was very beneficial for me and helped me get a good grade. I got a 7 my GCSE Maths final exams. I would highly recommend her to everyone who is looking for a Maths tutor. Thank you so much Ms Dala.

25/08/2025

Sarola - Rochdale

I’d especially like Thank the maths teacher Miss Dajana Dala, who has been absolutely outstanding. Her teaching style is clear, structured, and incredibly effective. Her explanations, patient approach, and ability to make complex topics easy to understand have made a world of difference. She breaks down difficult GCSE maths topics in a way that makes them easier to grasp, and always takes the time to ensure the topic is understood before moving on Since joining the centre, my child’s confidence in maths had grown tremendously. She had gone from feeling overwhelmed to tackling exam papers with ease — and it’s reflected in her final GCSE maths results. I highly recommend Dajana to any parent looking for quality maths teacher. Thank you so much!

24/08/2025

Oluchi - Colchester

Dajana Dala is a wonderful Maths teacher. She helped my Son through his GCSE. She started teaching him in year 8 and was with him until he wrote his GCSE. She really made Maths very easy for him such that he has now considered taking Maths for her A-level. Dajana has a remarkable ability to break down complex GCSE maths topics into clear, understandable steps. She takes the time to ensure each concept is fully grasped before moving on, which has made a huge difference. Since joining the Science Clinic, my child’s confidence in maths has grown tremendously — going from feeling overwhelmed to tackling exam papers with ease. This progress was clearly reflected in their final GCSE maths results. I highly recommend Dajana to any parent looking for a dedicated and effective maths teacher. Really appreciate what you did.

24/08/2025

Mika - London

Very good at going into the details of a topic and helped me understand topics at a deep level. Also clear on aspects I needed to improve most. I managed to get an A in Physics

15/08/2025

Mika - London

Very helpful and clear on what areas I need to improve on the most which is the most important. I managed to get an A in Mathematics

15/08/2025

Alberto - London

Dr Azad Noor is a wonderful Physics teacher. He excellently helped my Son through his AS & A-level Physics exams. He used to get Ds in his mocks but he eventually got an A in his final exams. He can now go to the University of his choice. I cannot thank you more Dr Noor, you really made Physics very easy for my son. I would highly recommend him to anyone who is looking for a private Physics teacher for their child.

15/08/2025

Alberto - London

Tom Lamb is a wonderful Maths teacher. He excellently helped my Son through his AS & A-level Physics exams. He used to get Ds in his mocks but he eventually got an A in his final exams. He can now go to the University of his choice. I cannot thank you more Tom, you really made Maths very easy for my son. I would highly recommend him to anyone who is looking for a private Maths teacher for their child.

15/08/2025

Duncan - Chelmsford

Hayley McCabe is a wonderful Maths Teacher and helped my daughter through her GCSE. She started teaching her in year 10 and was with her until she wrote her GCSE. She really made Maths very easy for her such that she has now considered taking Maths for her A-level. I would recommend her to anyone who is looking for a Maths Teacher.

10/08/2025

Duncan - Chelmsford

Katie Hunter is a wonderful English Language & Literature tutor and helped my daughter through her GCSE. She started teaching her in year 10 and was with her until she wrote her GCSE. She really made English very easy for her such that she has now considered taking English Language for her A-level. I would recommend her to anyone who is looking for a Tutor of English Language & Literature

10/08/2025

Duncan - Chelmsford

Muneebah Jasat is a wonderful Science tutor and helped my daughter through her GCSE. She started teaching her in year 8 and was with her until she wrote her GCSE. She really made Science very easy for her such that my daughter has now considered taking Biology for her A-level. I would recommend her to anyone who is looking for a Science Tutor.

10/08/2025

Tash - Manchester

Christine is an exceptional tutor, she really takes her time to ensure that the child understands her well. I signed up for online sessions with Science Clinic and allocated her to teach my son Sciences, her lessons are so well structured, organised and affordable. I managed to sign up for Maths as well in the end. You are not locked into a contract like what a lot of tutoring companies i used in the past do. I will highly recommend this company to anyone looking for a similar service. If Christine will be available, please ask them to allocate her to teach Science to your child.

23/07/2025

Shamim - London

Christine is a very good tutor. My daughter has made tremendous improvements in Sciences barely 2 months after signing up with the Science Clinic. Will highly recommend. Thank you so much Christine.

23/07/2025

Chris - London

Hayley has been a wonderful teacher for my son. She really helped him prepare for his Maths GCSE exams and made him feel as he was going in the exam room. The last few months leading to his exams have really been very good for him. I highly recommend you as a great Maths Tutor. Thank you Hayley.

04/06/2025

Zenia - Liverpool

Dajana Dala is a really lovely, kind tutor who helped me so much in maths as I started understanding and enjoying maths when I used to hate it and get low grades. She is always ensuring I understand the work and if I don’t she will make sure to help me through different ways and tricks so I understand. Thanks to Dajana, my grades have improved and I actually feel like I’m prepared for my exams. I’d highly recommend her to anyone looking for a skilled, reliable, and encouraging math tutor.

01/06/2025

Tina - Clacton-on-Sea

Hayley was a genuine, personable tutor from the start. Giving my daughter confidence and guidance from the first lesson. Also happy to explain in a relatable way, making learning easier. My daughter needed the confidence to know she could tackle maths, which she now seems to is capable of understanding so much more. I will be 100% recommending Hayley and the service to anyone that requires this support. I will be asking for Hayley’s expertise should we need this supporting in future. Thank you, Hayley you were worth every penny.

21/03/2025

Mrs.Shabana - London

Absolutely the right decision to choose science clinic tutoring, tutors as well as tutors managing team are very cooperative, helpful to manage time with teenager. My child love to take lesson never ran away from extra educational help and guidance. The GCSE Maths tutor Ms Dajana Dala smartly explained to my child and made complex problems very easy, sometimes took extra time to cover her lesson and she was always on time. So A BIG THANK to her and the Management Team at Science Clinic. Will definitely recommend.

22/02/2025

Mabel - London

My Son worked with Dajana Dala to prepare for Maths GSCE exams. Dajana is reliable and well organised therefore I would highly recommend her. She helped my son a lot to understand difficult topics. Thank you Dajana and the entire Science Clinic Team.

22/02/2025

Juliana - Chelmsford

Dajana is a wonderful Maths teacher and helped my daughter through her GCSE. She really made Maths very easy for her such that my daughter has now taken A-level Maths for her 6th form. I would definitely recommend her.

22/02/2025

Ola - Chelmsford

Hello Science Clinic Team, Just wanted to thank your tutors for all their help and support they gave my son, the academic transformation within that short space of time was amazing, there is no way Tade would have achieved the grades he got without your help.....all his tutors were fantastic especially Ms Iqra Shah who was exceptionally good, her resounding knowledge of Science has truly transformed my son within weeks Tade was looking forward to her lessons. I know my wife has given a review on your website, I just wanted to send you a personal text to express my gratitude, I'm sure in years to come, Tade will look back with gratitude for the role Ms Shah played in his life....my wife has referred you and your company to some of her friends and will continue to do so. Thank you once again for time you dedicated to my son.

15/02/2025

Yemi - London

Ms Iqra Shah was great! She brought my son up to speed really quickly as we came to her very late on. She was flexible if we needed extra sessions and warm and friendly. Thank you so much for your patience and enragement in teaching my son Science. His confidence improved significantly and the final grades in all 3 Sciences were really good.

15/02/2025

Nash

My daughter received science and maths tuition from Nada whilst studying for her A levels. My daughter benefited hugely from Nada’s enthusiasm and energy, as well as her knowledge of sciences in particular. Nada improved exam question answering technique and enhanced my daughter’s understanding of more complex topics. Crucially Nada instilled confidence and reassurance and always went the extra mile to help.

22/01/2025

Akua - London

Dajana is an excellent Maths teacher. She is exceptionally good and makes Maths very easy. She helped my daughter through her GCSE . I would definitely recommend

19/01/2025

Swati - London

Mr Fletcher is an amazing tutor and very patient and accommodating. The boys absolutely love him and I would definitely go with him.

06/11/2024

Renata - Birmingham

My daughter worked with Katie Jackson to prepare for her GCSE Science exams. Katie is reliable, professional and well organised, therefore, I would highly recommend her. My daughter stated that lessons with Katie helped her a lot to understand difficult topics. Thank you so much Katie and the entire team @ Science Clinic Private Tutors.

01/11/2024

Mrs Dale - Chelmsford

Hayley McCabe was excellent, well prepared, knowledgeable and personable. She made Maths very easy for our daughter. Will highly recommend Hayley.

30/10/2024

Cláudia - Chelmsford

Hayley McCabe was great with our son. She helped him not only build on his knowledge in Maths, but also his confidence going into his GCSE's. Our son found her very helpful and she explained subjects in a way that really suited him. We will definitely recommend Hayley.

30/10/2024

Sarah - Ingatestone

Hayley tutored my son in Maths to help prior to his GCSEs. She really helped him to build his confidence along with his knowledge and hopefully that will be reflected in his results in August! I would definitely recommend her to anyone who needs Maths assistance.

30/10/2024

Georgeta - London

My daughter was happy with her Maths tutor Ms Hayley McCabe. Her experience and passion for teaching can be seen from her attitude, way of approaching children and preparation for seasons. My daughter did extremely well in her Maths. I highly recommend.

30/10/2024

Emma - Liverpool

Katie Jackson was great! She brought my daughter up to speed really quickly as we came to her very late on. She was flexible if we needed extra sessions and warm and friendly. My daughter really did very well in all her 3 Sciences. Thank you so much Katie. Will highly recommend.

30/10/2024

Georgeta - London

My daughter was happy with her Science tutor Ms Holly Marks. Her experience and passion for teaching can be seen from her attitude, way of approaching children and preparation for seasons. My daughter did extremely well in her Combined Sciences. I highly recommend.

30/10/2024

Hannah - Chelmsford

Would highly recommend. I couldn’t fault my daughter’s tutor Holly, Holly made the lessons enjoyable, productive and she really listened to my daughter in terms of where she felt she had gaps in her knowledge. She really looked forward to her weekly lessons, and I know it helped her to achieve the high grades she recently received for her GCSE results. Holly’s support and guidance was extremely valuable.

30/10/2024

GOOGLE REVIEWS

All Reviews Other Reviews Google

Science Clinic Private Tutors

5.0 rating of Parents reviews

Amaka Bosah

Maths - Ms MEHRIN Mazhar
English - Ms Sue SCHULKINS
Science - Mr MEHTAB Ali
Thank you all so much for you input and tuition.
My son passed all his papers I’m grateful

12/01/2023

Amina Begum

My son had his tuition classes from mehtaab for science. He benefitted a lot and it also helped to pick up his grades. His results are not due until august. I am enrolling my daughter as i found him very helpful. Highly recommended

12/01/2023

Sarah Axcell

12/01/2023

Juliana

Maths Tutoring Dajana is a wonderful Math teacher and helped my daughter through her GCSE . I would definitely recommend Dajana

12/01/2023

Amaka Bosah

Maths - Ms MEHRIN Mazhar
English - Ms Sue SCHULKINS
Science - Mr MEHTAB Ali
Thank you all so much for you input and tuition.
My son passed all his papers I’m grateful

12/01/2023

Amina Begum

12/01/2023

Sarah Axcell

12/01/2023

Juliana

Maths Tutoring Dajana is a wonderful Math teacher and helped my daughter through her GCSE . I would definitely recommend Dajana

12/01/2023

Associations

Science Clinic Private Tutoring is proud to be associated with the following organisations…

The Digestive System

Digestion

Tissues & organs of the human digestive system

The importance of bacteria in digestion

WHAT OUR CUSTOMERS ARE SAYING ABOUT US

Sneha - London

Jesse - Colchecter

Jesse - Colchester

Sarola - Rochdale

Oluchi - Colchester

Mika - London

Mika - London

Alberto - London

Alberto - London

Duncan - Chelmsford

Duncan - Chelmsford

Duncan - Chelmsford

Tash - Manchester

Shamim - London

Chris - London

Zenia - Liverpool

Tina - Clacton-on-Sea

Mrs.Shabana - London

Mabel - London

Juliana - Chelmsford

Ola - Chelmsford

Yemi - London

Nash

Akua - London

Swati - London

Renata - Birmingham

Mrs Dale - Chelmsford

Cláudia - Chelmsford

Sarah - Ingatestone

Georgeta - London

Emma - Liverpool

Georgeta - London

Hannah - Chelmsford

GOOGLE REVIEWS

Amaka Bosah

Amina Begum

Sarah Axcell

Juliana

Amaka Bosah

Amina Begum

Sarah Axcell

Juliana

Associations

Unlock Your Child’s Potential with our experienced UK trained Teachers!

GET IN TOUCH

Popular Cities

Useful Links

Popular Subjects