 How do the body’s defenses prevent pathogens from entering the body? › Through internal & external defenses  Internal – white blood cells, T/B cells  External – tears, skin, mucous membranes, hair, nails

 How does the immune system attack pathogens? › Inflammation – fever › T cells attack and B cells remember so it doesn’t get sick again

 Noninfectious diseases that CANNOT be passed on from person to person › Caused by genetic or environmental factors or mutagens  Infectious diseases passes from person to person › Caused by pathogens, including bacteria, fungi, parasites, and viruses

 Parasites can cause disease › lice  Infectious fungi can cause skin infections › Ring worm, athletes foot  Viral diseases are spread easily › Colds, flus, HIV/AIDS  Infectious bacteria spreads easily › Different types of bacteria causes strep, bronchitis, tonsillitis, tuberculosis, sinus infections, food poisoning  Each pathogen causes a specific disease

 Read pgs 114 – 117 and answer questions (handout)  Draw a table with 3 columns – › Column 1 – diseases I’ve had › Column 2 – diseases family members have had › Column 3 – diseases I’ve never had but have heard of