This essay has been submitted by a student. This is not an example of the work written by professional essay writers.

An Overview of Digestive System: Definition and Functions

downloadDownload printPrint

Pssst… we can write an original essay just for you.

Any subject. Any type of essay. We’ll even meet a 3-hour deadline.

Get your price

121 writers online

Download PDF

Definition of Digestive System

We can say that the digestive system is a process which involves a number of organs that helps us to digest our food and absorb the nutrition from it. It starts from our mouth and it ends at the anus. It is the process of breaking down of food and liquid in smaller parts so that our body can generate energy from it for survival. All animals have a digestive system, but the shape and the sizes are different. For example, humans have only one stomach while a cow has four stomachs. Thus, it depends upon the needs and the functions.

Observation on Digestive System

• Function of Saliva

Saliva is produced in our salivary gland and it has a very important role in the digestive system. It lubricates the food, moisten it and then it creates a food bolus so that it can pass through our food pipe easily. It also activates our taste receptors and prevents sudden changes in the PH level. Saliva also has lysosomes (Suicide Bags) which help in killing the microorganisms. For instance, we all have seen animals like dogs and cats licking their wounds. By licking, they are cleaning the wound as it kills microorganism growth, so it has some medicinal properties also.

• Why is Bile present inside our body?

Bile is a fluid which contains water, electrolytes, and organic molecules. The main function of bile is the absorption of fat and fatty acids in our small intestine. On average, an adult produces around 400-800 ml of bile a day.

• Why is Bacteria present inside our digestive system and how it benefits our body?

Inside our gut, there are about 400-500 different kinds of bacteria. The bacteria present inside to protect us from various kinds of diseases, and it breaks down the large food molecules into smaller one and helps in the digestion.

• Fiber vs. Digestive system

The human digestive system cannot digest the fiber. It is directly passed to the intestine and only water is absorbed from it but there are many benefits of eating fiber like it prevents constipation, keeps our digestive system smooth, maintains our healthy weight, type 2 Diabetes risk is reduced, reduces the risk of cancer and keeps our bones healthy.

Digestive System of Plants

Plants do not need a digestive system to digest their food. The reason behind this is that plants make their own food by a process named ‘Photosynthesis’ in which they use sunlight, water, and carbon dioxide to synthesize the organic material. Plants also need phosphorous, nitrogen and potassium which they can directly absorb from the soil, so they require no digestion.

Ways to Keep Our Digestive System Healthy

It’s very important to keep our digestive system healthy because we need the energy to survive and energy is generated from food by the digestive system. Here are some ways in which we can keep our digestive system healthy.

  • Eating more fiber-rich foods for better performance
  • After eating food take a walk of about 5-10 minutes so that food can be digested easily.
  • Eating a Balanced Diet and avoid fast food, fried food, and fatty foods.
  • Avoid bad habits such as drinking alcohol, smoking, vaping, immediately sleeping after having dinner because it will slow down your digestion rate and will affect the digestive system.
  • Chewing the food thoroughly and drinking more and more water as water helps to clean our digestive system.


Why is digestion necessary?

According to me, digestion is necessary because our body needs nutrients which we can get from foods and drinks to keep our body working properly. Nutrients like carbohydrates, proteins, fats, vitamins, minerals etc. need to be synthesized and synthesis can be done only in our digestive system in order to get energy from it.


As compared to any other system, the digestive system is one of the most important systems in our body as we can’t live without it because food can’t be digested without this system and enzymes also play a very important role in synthesizing the food. According to research by a scholar, if there are no enzymes in our stomach and small intestine a single batch of food will take 10 years to digest and pass through our whole digestive system. However, if we want to compare our digestive system with something, we can compare it with the fuel injection system of an automobile. As in automobiles, fuel is firstly filled into tanks then it is passed to the combustion chamber where it is synthesized with some other material and then it is used to generate energy from that fuel by which the engine of a car or any other vehicle works. The waste products are then moved into the exhaust from where they are released into the air in the form of gas or liquid. Thus, our digestive system works the same as the fuel injection system of an automobile. We can compare food with fuel, intestines with combustion chambers and excretion of food with the exhaust of a car. 

Remember: This is just a sample from a fellow student.

Your time is important. Let us write you an essay from scratch

experts 450+ experts on 30 subjects ready to help you just now

delivery Starting from 3 hours delivery

Find Free Essays

We provide you with original essay samples, perfect formatting and styling

Cite this Essay

To export a reference to this article please select a referencing style below:

An Overview Of Digestive System: Definition And Functions. (2021, Jun 09). GradesFixer. Retrieved October 28, 2021, from
“An Overview Of Digestive System: Definition And Functions.” GradesFixer, 09 Jun. 2021,
An Overview Of Digestive System: Definition And Functions. [online]. Available at: <> [Accessed 28 Oct. 2021].
An Overview Of Digestive System: Definition And Functions [Internet]. GradesFixer. 2021 Jun 09 [cited 2021 Oct 28]. Available from:
copy to clipboard

Sorry, copying is not allowed on our website. If you’d like this or any other sample, we’ll happily email it to you.

    By clicking “Send”, you agree to our Terms of service and Privacy statement. We will occasionally send you account related emails.


    Attention! This essay is not unique. You can get a 100% Plagiarism-FREE one in 30 sec

    Receive a 100% plagiarism-free essay on your email just for $4.99
    get unique paper
    *Public papers are open and may contain not unique content
    download public sample

    Sorry, we could not paraphrase this essay. Our professional writers can rewrite it and get you a unique paper.



    Please check your inbox.

    Want us to write one just for you? We can custom edit this essay into an original, 100% plagiarism free essay.

    thanks-icon Order now

    Hi there!

    Are you interested in getting a customized paper?

    Check it out!
    Having trouble finding the perfect essay? We’ve got you covered. Hire a writer

    Haven't found the right essay?

    Get an expert to write you the one you need!


    Professional writers and researchers


    Sources and citation are provided


    3 hour delivery