how does our body fight off infection??? our body’s defenses

HOW DOES OUR BODY FIGHT OFF INFECTION??? Our Body’s Defenses

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HOW DOES OUR BODY FIGHT OFF INFECTION???Our Body’s Defenses

The First Line of DefenseStops germs from getting into the bloodstream.

Traps, repels and destroys germs BEFORE they make you sick.

Page 3: HOW DOES OUR BODY FIGHT OFF INFECTION??? Our Body’s Defenses

Five Barriers that Protect the Body

Skin – the body’s largest barrier

Mucous membranes – Found in ears, eyes, nose and throat

SalivaTears Stomach acid

Page 4: HOW DOES OUR BODY FIGHT OFF INFECTION??? Our Body’s Defenses

The Second Line of Defense

Immune System A combination of body defenses

made up of cells , tissues and organs that help fight infections.

White Blood Cells Cells that work together to warn,

track down and destroy germs.

Page 5: HOW DOES OUR BODY FIGHT OFF INFECTION??? Our Body’s Defenses

3 Types of White Blood Cells

Phagocytes

T-Cells

B-Cells

Page 6: HOW DOES OUR BODY FIGHT OFF INFECTION??? Our Body’s Defenses

PhagocytesThese white blood cells send a warning that a germ (invaders) has entered the bloodstream

Page 7: HOW DOES OUR BODY FIGHT OFF INFECTION??? Our Body’s Defenses

T-CellsThese white blood cells track down the invading germ and mark the germ with antibodies.

Page 8: HOW DOES OUR BODY FIGHT OFF INFECTION??? Our Body’s Defenses

B-Cells

These white blood cells destroy germs and anything else marked with an antibody.

Sometimes the b-cells need back-up support in the form of medicine in order to fight the really tough germs.

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