Immune System L02

Question 1

Describe the term ‘immunity’.

Answer 1

The ability to fight infection/disease by producing antibodies or killing infected cells.

Question 2

Describe the ‘immune system’ (briefly).

Answer 2

The system is responsible for maintain homeostasis by recognising harmful from non-harmful organisms and produces and appropriate response.

Question 3

State the first line of defence and what each does to prevent harm. (hint there are 6)…

Answer 3

1. Saliva - antibacterial enzymes
2. Tears - antibacterial enzymes
3. Mucus - livings traps dirt and microbes
4. Skin - prevents entry
5. Stomach Acid - low PH kills harmful microbes.
6. Good gut bacteria - out compete bad.

Question 4

State the 5 types of pathogens.

Answer 4

1. Bacteria
2. Virus
3. Protozoa
4. Fungi
5. Parasites

Question 5

What are antigens?

Answer 5

Antigens are toxins that are produced by pathogens that cause harm to an organism.

Question 6

State the 5 second line of defence…

Answer 6

1. Phagocytosis
2. Natural Cell Killers
3. Inflammation
4. Fever
5. Macrophage