The document defines key terms related to the immune system's defense against pathogens, including that pathogens are disease-causing organisms and resistance is the body's ability to counteract pathogens. It describes non-specific defenses that act against all harmful agents and specific defenses that attack particular pathogens and result in immunity. The immune system consists of three lines of defense: the first line is non-specific barriers like skin and mucus; the second line is non-specific responses like chemicals and inflammatory cells; and the third line is specific responses from lymphocytes and macrophages.

1. Overview of Defense Mechanisms
(pg 4)

2. Overview of Defense Mechanisms
(pg 4)
• Pathogen = Disease-producing organism
(bacteria, virus, fungus, protist, worm, etc.)

3. Overview of Defense Mechanisms
(pg 4)
• Pathogen = Disease-producing organism
(bacteria, virus, fungus, protist, worm, etc.)
• Resistance = Body’s ability to counteract
pathogens

4. Overview of Defense Mechanisms
(pg 4)
• Pathogen = Disease-producing organism
(bacteria, virus, fungus, protist, worm, etc.)
• Resistance = Body’s ability to counteract
pathogens
• Non-specific mechanisms: act against all
harmful agents

5. Overview of Defense Mechanisms
(pg 4)
• Pathogen = Disease-producing organism
(bacteria, virus, fungus, protist, worm, etc.)
• Resistance = Body’s ability to counteract
pathogens
• Non-specific mechanisms: act against all
harmful agents
• Specific mechanisms: attack particular
pathogens. Results in immunity because the
body “remembers” the pathogen

6. Immune System consists of 3 lines of
defense
1. First line of defense (non-specific):
Skin, mucous membranes, and their
secretions

7. Immune System consists of 3 lines of
defense
1. First line of defense (non-specific):
Skin, mucous membranes, and their
secretions
2. Second line of defense (non-specific):
Chemicals, Phagocytic cells, inflammation

8. Immune System consists of 3 lines of
defense
1. First line of defense (non-specific):
Skin, mucous membranes, and their
secretions
2. Second line of defense (non-specific):
Chemicals, Phagocytic cells, inflammation
3. Third line of defense (specific): Lymphocytes
and macrophages

9. Diagram (pg 4)

10. Output (pg 5)
Come up with an analogy of a place that might
be invaded. Use all of page 5 to draw a color
picture
1. Draw the place and the invaders and explain
each in words
2. Draw and label the first, second, and third
lines of defense. Write an explanation of how
each one is similar to the corresponding line
of defense in the immune system