ANATOMY

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: -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: -Organs and tissues important to the proper functioning of the immune system include the thymus and bone marrow, lymph nodes and vessels, spleen, and skin.

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.