Immunity of Human Being

Mean:
         Immune              resistance
         Ity                       Condition/occurrence
Definition:
                 "The ability of a body which resist against the disease or pathogen is known as immunity"
Immunology:
                       It is the branch of biology in which we can study about immunity.

Note: from disease, we can protect over self by 3 line defense. These lines of defense are given below;

1-First line Defense:
Definition:
                 "There is not any specific and inclouded structure, chemicals and processes that work to prevent pathogens from entering the body".
Components of 1st line defense:
                                                   There are the main three-component which are included in 1st line defense
1-Skin
2-defense against respiratory tract
3-defense against digestive tract
Diagram:

the second diagram is used for digestive and respiratory system

2-second line of defense:
definition:
               "It is also called non-specific defense".
Components of  2nd line defense:
                                                        the main component of 2nd line defense is the following
1- Macrophages and Neutrophils
2- Natural killer Cell
3-Complement System
4-Interferon
5-Inflammatory Response
6-Pyrexia and Pyrogens
Diagram: