YR3-CH10-LSN4-Barrier

• Biologie
• Middelbare school
• vwo
• Leerjaar 3

LESSON 4

CHAPTER 10

INNATE IMMUNITY

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 phagocytes contribute to immunity

Keywords

Innate immunity

Adaptive immunity

Barrier function

Phagocyte

Phagocytosis

Lymphatic system

Lymph nodes

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

To what part of the immune system do these lines of defence belong?

Innate immune system

Adaptive immune system

Barriers

Phagocytes

Lymphocytes

Lines of defence

Line 1: Barriers

Keeping pathogens out

• skin
• mucosal membranes
• stomach acid
• antibacterial proteins

Note locations in your body that are lined by a mucosal membrane

Line 1: Barriers

Mechanical barriers                   vs               Chemical barriers

Physical blockages preventing pathogens from entering the body

Attacking pathogens by means of antimicrobial molecules

As part of innate immunity, the human body utilises mechanical and chemical immunity Which of the following is an example of chemical immunity?

1. Skin
2. Fluid flow in the urinary tract
3. Stomach acid
4. Mucosal layer in the vagina

Explain how washing your skin with soap regularly is countering your immunity.