There are two types of immune systems: 1. The Humoral Immune System 2. The Cell Mediated Immune System. 1. The Humoral Immune System: The humoral immune system involves the antibodies that get dissolved in extracellular fluid such as blood plasma, lymph and mucus secretion. These were formally known as humors. The humoral immunity is conferred through B-cells that develop from [...]
The following points highlight the two main types of organs present in immune system of humans. The types are: 1. Primary Lymphoid Organs 2. Secondary Lymphoid Organs. Type # 1. Primary Lymphoid Organs: Primary lymphoid organs (PLO) are the major sites of lymphocyte development i.e. lymphopoiesis. Lymphocytes differentiate from lymphoid stem cells, proliferate and mature into functional cells called immuno-competent [...]
In this article we will discuss about the active and passive immunity of cell-mediated. 1. Active Immunity: On the basis of immunity acquired, active immunity may be natural or artificial. i. Natural active immunity: It results from either a clinical or an in-apparent subclinical infection by a microbe after repeated exposure to small doses of the infecting organism, which passes [...]