Transcript The Immune System

CENTERVILLE
8th Grade Health


The body's defense against germs and other
invaders
Made up of special cells, proteins, tissues,
and organs

First Line
◦ Act as barriers to prevent pathogens from entering
body

Second Line
◦ Act when tissues are injured or damaged
◦ Signs and symptoms letting you know you are sick

Third Line
◦ Act to destroy and remove pathogens


Skin
Mucus membranes
◦ Tissues that protect the interior surfaces of the
body that may be exposed to pathogens
◦ Secrete MUCUS—a sticky fluid that traps pathogens

Tears/saliva/sweat
◦ Contain lysozome—an enzyme that breaks down
the cell wall of certain pathogens

Fever
◦ Chemicals are released, increasing body temp.


Gastric juices
Pain





Macrophages
Lymphocytes
Antibodies
Lymph Nodes
Vaccines


Pac-man like white blood cells (WBCs)
Consume and destroy pathogens



Specialized WBCs
Activate the immune response
Helper T-cells
◦ Detect the virus and alert the Killer Ts and B-cells

Killer T-cells
◦ Release chemicals to destroy pathogens

B-cells
◦ Make antibodies



“Lock” into pathogen (antigen) and destroy it
Remain in the blood stream
Antibodies at work...

Trapping stations to
destroy infection

Small or weakened dose of the pathogen
(antibodies)