The Immune System is your body defence system. It has soldiers which we call white blood cells or the scientists call leucocytes. They are three main white blood cell types:- T & B cells (lymphocyte) or the macrophages that ingest the bacteria. Granulocyte help combat pathogen infections as well as allergies.
The white blood cells are deployed all over the body by the lymphatic system. A set of roads running through your body with checkpoint stations called lymph nodes.

White blood cells are your bodies natural defence system. White blood cells defeat bacteria in three ways:-

  • Firstly they attack and eat the microbes.
  • They use antibodies to neutralise them and squeeze them together to be eaten.
  • Others use antitoxins to neutralise toxins in some bacteria. Some bacteria use poisons for defence and attack.

T-Cells are made and maintained in the thymus.

The T cells are designed to attack and engage the enemy microbes. They will even eliminate a cell to defeat an infection.
The T cells are the spies of your body. They search your body for pathogens and activate a chemical signal alerting B cells.
The T cells are created to stop T1 cells getting carried away and killing to many body cells.

B-Cells are our chemical warfare units. They are equipped with antibodies which eliminate the invading microbes. Each B cell has a chemical coating to produce antibodies which are specially designed to kill a particular microbe or past invader. When a microbe re-enters the body, the body is prepared, it has the correct antibodies to fight it off. B cells are stored in our lymph nodes.

The antibodies also glue the microbes together which makes it easier for the monocyte unit to engulf them.

B cells are produced in your bone marrow.

Macrophages engulf the microbes which have been stuck together by the B cells’ antibodies. It is every microbes (except viruses) nightmare to come across a macrophage or as the microbes say, the white tank.
Skin Stomach Cilia Cells
The skin is your bodies first natural defence, it acts as a barrier.
 Your stomach acid kills most of the bacteria that enters your body through the oesophagus.
Your cilia cells and mucus collect dirt and dust and bacteria before they reach the lungs.