What is the Immune System?

The Human Immune System

What is the Immune System?

The immune system’s main role is to protect you from bacteria, viruses, fungi, and toxins that are harmful to your mind and your body.

The immune system is made up of a complex network of organs, proteins, specialized cells and tissue and it is one of the major systems of the body.

We need to ensure our immune system is robust and healthy so that it functions efficiently, effectively and at peak performance.

What is the Immune System Made up of?

The 3 main parts of the immune system are: 

  • The Innate Immune System: Innate immunity is the defense mechanism that kicks in immediately or after a few hours, you were born with this system already in place and it is the most dominant of the 3.
  • The Adaptive Immune System: This develops gradually over time after your body builds up its own immunity after being exposed to bacteria and viruses.
  • The Passive Immune System: This system is activated when you are given antibodies  via a vaccine to fight an infection instead of using antibodies produced by your own immune system.


  • The Lymphatic System: A network of channels throughout the body that carries lymphocytes to the lymphoid organs and bloodstream.
  • The Complement System: Made up of numerous distinct plasma proteins.
The Complement System antibodies block viruses from entering a body cell.
The Immune System is made up of many different systems.

 Components of the Immune System

  • The Skin: This is the largest organ of our body, a physical all over barrier against the external environment.
  • White blood cells: These are made in your bone marrow and are part of the lymphatic system.
  • Antibodies: A protein produced by the Adaptive Immune System and the Innate Immune System.
  • The Complement System: Made up of numerous distinct plasma proteins.
  • Adenoids: Two glands located at the back of the nasal passage which is in fact the Pharyngeal Tonsils.

    The Lymphatic System
    Carries lymphocytes to the lymphoid organs and bloodstream.
  • Bone Marrow: Soft, spongy tissue found in bone cavities.
  • Lymph Nodes: Small organs shaped like beans, which are located throughout the body and connect via the lymphatic vessels.
  • Peyer’s Patches: Lymphoid tissue in the small intestine.
  • Spleen: A fist-sized organ located in the abdominal cavity.
  • Thymus: Two lobes that join in front of the trachea behind the breastbone.
  • Thyroid gland: A small, butterfly-shaped gland located in the base of the neck just below the adams apple.
  • Liver: The liver contains many immunologically active cells, acting as a “sieve” for antigens carried to it via the portal system as well as many other functions.

The Tonsils:

There are 3 sets of tonsils in the body which are also part of the lymphatic system.

  • Pharyngeal Tonsils: A mass of lymphatic tissue attached to the back wall of the nasal pharynx located in the upper part of the throat opening into the nasal cavity.

    Did you know that you had 3 sets of tonsils.
    We have 3 sets of tonsils….Who knew?
  • Palatine Tonsils: Two lumps of tissue situated on both the left and right at the back of the throat.
  • Lingual Tonsils: Lymphatic tissue which is on the surface tissue of the base of the tongue.

There are numerous more not listed, but as with those listed above, each one stands up on its own merits in regard to responsibility and function.

All have an equally important and fascinating role to play in the war zone that is your body.

By having a healthy immune system you will have a much better chance in fighting and recovering from the more serious viruses out there such as the Influenza Virus.

The COVID -19 corona virus is not the only deadly virus out there right now and it most certainly won’t be the last unknown virus we will have to face.

Please feel free to leave any advice, thoughts or comments in the space provided below, they are always encouraged and always very much appreciated.

Stay Safe, Stay Healthy, Stay Strong

About Mitch founder of Immune System Explained in Clarendon Jamaica.

Mitch X:-).

*Please note the information contained in this post is intended for the purpose of general information and should not be used as a substitute for the individual expertise and judgement of healthcare professionals.


2 thoughts on “What is the Immune System?

  1. Kokontala says:

    I’m very much impressed by this article, it somehow reminds me of some forgotten biology staff at my high school level. Our body’s immune system is very important of course because it protects our bodies against harmful bacteria and viruses as you’ve mentioned. Little did I know that there are major systems and sub-systems that make our immune system. I truly enjoyed your article and thanks for being so informative and educative.

    1. Mitch says:

      Hi Kokontala,

      So pleased you enjoyed my article and was able to take away something you didn’t know before, I think my age maybe showing with regard to high school biology staff member, it was actually one of my favorite subjects, still is. 😊

      Yes our Immune Systems are awesome and its not until I really checked it out that I realized just how amazing it really was.

      I’m really quite shocked at some of the things I am discovering and will be regularly posting some really beneficial information that I feel should be common knowledge.

      I truly believe there would be a lot less sick people in the world if we knew half of what I have discovered so far.

      Thank you so much for your visiting and your compliments I really hope to see you again soon, your comments and input will always be welcomed and always very much appreciated.

      Stay Save, Stay Healthy, Stay Strong

      Mitch X:-).


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