1. Section 31-2 “Immune System”

2. Cells and proteins fight the body’s infections.
White blood cells attack infections inside the body
Phagocytes engulf and destroy pathogens
T cells (leukocytes) destroy infected cells if not recognized (so not destroyed) then B cells form
B cells produce antibodies

3. Cellular immunity uses T cells (white blood cells) to destroy infected
There are two specific immune responses
Cellular immunity uses T cells (white blood cells)
to destroy infected
body cells
pathogen
antigens
T cell
receptors
activated T cells
memory T cells

4. Humoral immunity uses B cells to produce antibodies if T cell doesn’t recognize pathogen.
memory B cells
activated B cells
antibodies

5. Both responses produce memory cells
B cell
T cell
specialized T and B cells
provide acquired (active) immunity

6. Three types of proteins fight off invading pathogens
Draw & Label Visual
Complement proteins weaken pathogen membranes
Antibodies make
pathogens ineffective
(bind w/ antigen on germ)
Antibody kills germ on
it’s own or it red flags germ so
white blood cell knows to kill.
antigen
antibody
pathogens
Interferons prevent viruses from infecting healthy cells

7. Cells of the immune system produce specific responses
Specific immune responses begin with the detection of antigens
Antigens are surface proteins on pathogens (red flags)
Each pathogen has a different antigen
virus
antigens

8. Immunity prevents a person from getting sick from a pathogen.
When you have immunity, pathogens are destroyed before you get sick
Passive immunity occurs without an imm- une response (outside source)
mother’s milk
genetics
Active immunity occurs after a specific immune response
(body makes it’s own antibodies)

9. Assignment!!
Activity: Using your book (tonight), Notes & Healthy Immune system handout to draw a comic strip to diagram the Inflammatory Response. (page 1087) Label all parts and explain the process.