Download Acquired immunity

Basics of Immune System
Everyone has two types of
immunity – innate and
acquired.
Innate immunity takes
advantage of physical
barriers your body has to
foreign invaders (skin,
mucous membranes,
stomach acid and circulating
white blood cells) to prevent
entrance by an antigen or
microbe.
Acquired immunity mounts
a response after an invader
has entered the body by
producing specialized cells.
Various specialized regions in
the body produce immune
system components.
Humoral immunity is part of
acquired immunity and relies
on production of antibodies
to attack pathogens. A small
number of “memory” cells
continually patrol the blood
and produce antibodies in
case of later infection.
Cell-mediated immunity is
part of acquired immunity
and relies on macrophages
that kill cells that become
infected.
Various specialized regions in
the body produce immune
system components.
The complement system is
another piece of the
immune system. It is made
up of about 25 specialized
proteins that help antibodies
destroy pathogens. It also
helps clear antibody-antigen
complexes that formed
during pathogen destruction.
As part of the action of the
complement system, the
inflammatory response is
triggered.