B5

Question 1

process of immune response

Answer 1

• phagocytes engulf pathogen
• phagocytes display antigens
• complementary T lymphocytes bind to antigen
  –> stimulates phagocytes, TH cells which stimulate B lymphocytes, cytotoxic T cells, T memory cells
• B lymphocytes
• englulf pathogens (not phagocytosis)
• displays antigen on the surface
• TH cell binds to antigen
• stim. B lymphocytes to divide
  –> memory B cells, plasma cells

Question 2

describe how vaccination can lead to protection against x

Answer 2

• the antigen of x binds to the surface receptor on a specific B cell
• T cells stimulate the activation and division of B cells
• activated B cells divide by mitosis- clonal selection