IMMUNOLOGY

Detailed explanation-1: -A healthy gut microbiome tends to include a wide range of different beneficial bacteria and is vital for a healthy immune system. It plays an important role in regulating your immune system so that it responds to injury or infection but doesn’t attack healthy body tissue.

Detailed explanation-2: -Primary lymphoid organs: These organs include the bone marrow and the thymus. They create special immune system cells called lymphocytes. Secondary lymphoid organs: These organs include the lymph nodes, the spleen, the tonsils and certain tissue in various mucous membrane layers in the body (for instance in the bowel).

Detailed explanation-3: -The immune system is a complex network of organs, cells and proteins that defends the body against infection, whilst protecting the body’s own cells. The immune system keeps a record of every germ (microbe) it has ever defeated so it can recognise and destroy the microbe quickly if it enters the body again.