Cells And Immune System (ANTIGENS)

Question 1

What are antigens?

Answer 1

Antigens are usually proteins that can generate an immune response when detected by the body

Question 2

Where are antigens found?

Answer 2

Antigens are usually found on all cell surfaces , you have antigens on your own body cells just as foreign cells have antibodies on their cell surfaces.

Question 3

What are antigens that arn’t normally found in the body referred to as?

Answer 3

Foreign antigens

Question 4

What do antigens allow the immune system to identify?

Answer 4

Pathogens
Abnormal body cells
Toxins
Cells from other individuals of the same species

Question 5

What is a pathogen?

Answer 5

A pathogen is an organism that causes disease.

Question 6

What do pathogens carry on their surface which triggers the immune response?

Answer 6

Foreign antigens

Question 7

What is meant by an abnormal body cell?

Answer 7

A cancerous or pathogen infected cell is an abnormal body cell.

Question 8

What do abnormal body cells carry on their surface to trigger an immune response?

Answer 8

Foreign antigens

Question 9

What is a toxin?

Answer 9

All toxins are poisons. A toxin is a molecule and not a cell

Question 10

Where do toxins come from?

Answer 10

Bacteria produce toxins

Question 11

Sometimes an organ is rejected by the body after a transplant procedure , why is this?

Answer 11

When you receive cells from someone else your body may notice that the antigens on the cell surface are foreign as even though the organ will have come from one of your own species its antigens may differ from your own , the foreign antigens trigger an immune response which leads to rejection of the transplanted organ.