Section 31-2 “Immune System”

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

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

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

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

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

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

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)

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.