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Question of the Day

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Question of the Day. Question: Describe our lab “CO 2 and You” to an absent student. (What did we do, how did we do it, what did you learn, what were the results, etc.) Answer: … … …. Turn in HW AFTER Quiz!.

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question of the day
Question of the Day

Question: Describe our lab “CO2 and You” to an absent student.

(What did we do, how did we do it, what did you learn, what were the results, etc.)

Answer: … … …

Turn in HW AFTER Quiz!

intro
Intro
  • Immune system- how your body defends against harmful viruses, bacteria, & fungi (pathogens)
  • Features multiple layers of defense
intro1
Intro
  • Allergies are exaggerated responses to foreign bodies
  • Immune system complicates organ transplantation
types of defenses
Types of Defenses
  • Non-specific defenses- guards against all pathogens indiscriminately; examples:
    • skin acts as physical barrier
types of defenses1
Types of Defenses
  • Non-specific defenses- guards against all pathogens indiscriminately; examples:
    • skin acts as physical barrier
    • mucous membranes trap pathogens

Staphylococcus auerus(yellow) sticking to mucous (blue) on cilia cells

types of defenses2
Types of Defenses
  • Non-specific defenses- guards against all pathogens indiscriminately; examples:
    • skin acts as physical barrier
    • mucous membranes trap pathogens
    • acidic environment of stomach is hostile
types of defenses3
Types of Defenses
  • Non-specific defenses- guards against all pathogens indiscriminately; examples:
    • skin acts as physical barrier
    • mucous membranes trap pathogens
    • acidic environment of stomach is hostile
    • fever speeds up body responses
    • white blood cells
    • inflammatory response
    • and more
types of defenses4
Types of Defenses
  • Specific defenses- targets certain pathogens
    • white blood cells mark particular pathogens for destruction & engulf them
antigens antibodies
Antigens & Antibodies
  • Antibodies- body’s proteins that bind to microbes, marking them for destruction
  • Antigens- a foreign molecule that triggers an immune response
    • Ex: proteins, polysaccharides, toxins
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