Topic 2 - Cell Recogntion And Immunity

Question 1

What is cell recognition?

Answer 1

A vital process in the immune system that allows the body to distinguish between self and non-self cells.

Question 2

What are the two key features of cell recognition?

Answer 2

1. Cell surface proteins and glycoproteins
2. Role of antigens.

Question 3

What is a cell surface protein and glycoproteins role in cell recognition?

Answer 3

• cell membranes contain unique proteins that act as antigens:
• These antigens enable the immune system to identify: self cells, non-cell cells, abnormal cells and toxins.

Question 4

What is the role of antigens in cell recognition?

Answer 4

• an antigen is a protein on the surface of a cell or virus that triggers an immune response
• Each cell has specific antigens making it unique

Question 5

What is the role of a T lymphocyte?

Answer 5

• Recognise antigens present on the surface of infected or abnormal cells
• Trigger an immune response, including the destruction of infected cells

Question 6

What is a B lymphocyte role?

Answer 6

-bind to specific antigens using antibodies
- produce antibodies to neutralise pathogen

Question 7

Explain the process of cell recognition

Answer 7

1. Lymphosis detect foreign antigens as non-self initiating the immune response.
2. Specific lymphocytes that recognise the foreign antigens are activated and divide rapidly
   3.. cytotoxic T cells destroy infected cells