Download - Defense
Defense
External Defense: Integumentary System
Internal Defense: Respiratory System Digestive System Circulatory System Lymphatic System Immune System
DefenseExternal Line of Defense:
SkinFunction:
Why do we have Skin ??Provide a barrier to Bacteria, Viruses, Fungi, Protist & parasites
Structures:Sweat & Oil glands secrete
acid
Defense: Skin, Mucus, Enzymes & Acid
DefenseInternal Defense
Respiratory System:Function:
Traps Pathogens with Cilia & Mucus • Enzymes
Structures:Cilia ( hair)Mucus Membrane
DefenseInternal Defense
Digestive System Function:
Kills pathogens with Enzymes
Acid (Hydrochloric acid) Mucus
Structure:Salivary glandsStomach glandsIntestinal glandsProduce Acid & Enzymes
DefenseInternal Defense
Circulatory System: Function:
Contains White Blood Cells• Surround & digest pathogens
System:White Blood CellsProduce Antibodies
Target Antigens A protein on the surface of an infected cell
DefenseInternal Defense
Lymphatic System/ Immune System:
Functions:Defends against Germs Lymphocytes destroy Bacteria
o Killer T –cellso White Blood Cellso B-cells: Antibodies
Remove excess Tissue Fluids (Lymph)o filters & purifies Lymph fluid
Produces Antibodies that stay in the blood
DefenseInternal Defense
Lymphatic System/ Immune System:
Structures:Lymph nodesLymph VesselsLymphocytes: T-cells & B-cellsAntibodies
DefenseInternal Defense
Specific Immunity:
Functions:Targets & destroys cells with
foreign AntigensMakes Antibodies
o B-cells
Structures:Lymphocytes called T cells: o Helper T – cells
Stimulate B-cellsStimulate Killer T -cells
o Killer T –cellsDestroy pathogens
Lymphocytes called B cells:o Make Antibodies
Natural Killer Cells
DefenseWorking Together
Both External & Internal Defenses keep your body germ free & healthy
Homeostasis
Nate’s Immune System Cartoon