Y3V-T2-LSN3

• Biologie
• Voortgezet speciaal onderwijs
• Leerroute 3

Welcome, please get ready:

• Pen and Paper
• Copy of the book

Disease & Immunity

Lesson 3

Barriers and 1st line of defence

Book page 146

Learning goals:

• I understand the difference in innate and adaptive immune system
• I understand the difference in specific and aspecific immune system
• I can explain what barriers in the human body contribute to immunity
• I can explain how each barrier contribute to immunity.

KEY WORDS:

• Innate immunity
• Adaptive immunity
• Barrier function

Lines of defence

Line 1: Barriers

• skin
• mucosal membranes
• stomach acid
• antibacterial proteins

Keeping pathogens out

Line 1: Barriers

Mechanical barriers       vs    Chemical barriers

Physical blockages preventing pathogens from entering the body

Attacking pathogens by means of antimicrobial molecules

Innate immunesystem

• Parts of the immune system that are present from birth

Adaptive immunesystem

• Parts and processes of the immune system that are changing based on previous experiences

Lines of defence

The immune system counters attacks from pathogens in three lines of defense:

1. Barriers: keeping the pathogens out

2. Phagocytes: attacking and wiping out invaded pathogens 

3. Lymphocytes: learning from phagocytes how to specifically and effectively kill a certain type of pathogen

Lines of defence

Homework for next lesson:

• Read page 152-154 from the book
• Make sure you master the learning goals LSN1-3
• Check the answers of homework assignment LSN1 on classroom