PATHOLOGY

Detailed explanation-1: -70% of the immune system is located in the gut, where diverse bacteria is best. You likely know that what you eat can affect your weight and energy level throughout the day.

Detailed explanation-2: -The immune system cells are directly beneath the mucous membranes, where they prevent bacteria and viruses from attaching.

Detailed explanation-3: -The key primary lymphoid organs of the immune system are the thymus and bone marrow, and secondary lymphatic tissues such as spleen, tonsils, lymph vessels, lymph nodes, adenoids, and skin and liver.

Detailed explanation-4: -These specialized cells and parts of the immune system offer the body protection against disease. This protection is called immunity. Humans have three types of immunity-innate, adaptive, and passive: Innate immunity: Everyone is born with innate (or natural) immunity, a type of general protection.