4 Lines of Defense Body has 2 lines of defense First = keeps pathogens outSecond = detects and destroys pathogens
5 First Line of DefenseSkin = barrier between your body and the environmentKeeps pathogens OUTReading page 568
6 Sweat Glands EXCRETE salts that help kill bacteria on skin Tears wash pathogens out of eyesAlso contain salt
7 Nose hair filters pathogens out of the air you inhale. Mucus and cilia trap also trap pathogens.
8 Stomach Acids kill pathogens that enter your body in food
9 Second Line of DefenseWhite blood cells – fight pathogens that get through the first lineTypes of white blood cell s used in 2nd defense:Phagocytes – swallow and destroy pathogensPage 569
10 Third Line of Defense Attacks specific pathogens Involves phagocytes, T-Cells, and B-cells (types of white blood cell)Page 570
11 B-Cells: Make Antibodies T-Cells: ATTACKB-Cells: Make AntibodiesAntibodies – proteins made by the body to kill a specific pathogenPage 571 figure 7
12 Immunity Immunity – bodies ability to protects itself from disease Two TypesActivePassive576 top paragraph
13 Active ImmunityActive Immunity – Develops after exposure to a pathogenImmune system is prepared to respond when it sees the pathogen againTwo ways:Get the diseaseVaccine – small dose of weakened pathogen introduced to body
14 Passive ImmunityPassive Immunity – Antibodies made by one organism are transferred to another organismAcquired:before birth, mother to babyVaccines with AntibodiesRabiesPage 580
15 Why might frequent hand washing help protect your from disease Why might frequent hand washing help protect your from disease? What are some other ways your could protect yourself and other people from disease?
16 Immune System: Lesson Review By which process can a person acquire active immunity to a disease?A. Injection with antibodiesB. Treatment with antibioticsC. VaccinationD. Following Sanitary Procedures
17 Immune System: Lesson Review 2. Which substance is involved in both active immunity and passive immunity?A. AntibioticB. AntibodyC. VaccineD. Mucus
18 Immune System: Lesson Review 3. How do phagocytes protect the body from disease?A. They produce white blood cellsB. They engulf and kill pathogensC. They produce T and B cellsD. They prevent pathogens from entering the body
19 Immune System: Lesson Review 4. Your mother is worried because she heard that the chickenpox vaccine your baby brother is going to receive is actually a weakened form of a viral disease. How do you explain to her that being injected with the disease will actually help protect your brother?