Goals & Objectives Identify 2 non-specific immune responses Define antigen and explain how antigens are involved in the specific immune response Define memory cell and explain how memory cells are involved in specific immune responses

Warm up: What are antigens and what do they do?

KEY CONCEPT The immune system has many responses to pathogens and foreign cells.

Nonspecific Responses: Nonspecific responses are the same for every pathogen: Inflammation white blood cells move toward infection and damaged tissue capillary wall extracellular space white blood cell characterized by swelling, redness, and pain

Discussion Question: What do you think the purpose of a fever is?

Nonspecific Responses: Fever Low fevers stimulate white blood cells to mature. High fevers can cause seizure, brain damage, and even death.

Specific responses are different for each pathogen. Involve detection of antigens Antigens are surface proteins on pathogens Each pathogen has a different antigen virus antigens

2 specific immune responses: Cellular immunity uses T cells to destroy infected body cells. pathogen antigens T cell receptors activated T cells memory T cells

Discussion Question: According to the charts we filled out the other day, what are the jobs of the T cells and B cells? T Cells – B cells -

Humoral immunity uses B cells to produce antibodies that match the shape of the antigen T cell pathogen memory B cells activated B cells antibodies

Specific responses produce memory cells. B cell T cell Memory cells recognize pathogens quickly after the initial exposure Causes a rapid immune response to prevent illness

Next: Turn to pages 952-953 and draw figure 31.1 in your notes.

Exit ticket: What are the two different types of immunity? What is the difference?