Immune System6th Grade Science

I. Function

A. Remove germsB. Aid in repair

II. Barriers

A. SkinB. Respiratory System (nose, mucus, cilia…)C. Digestive System (acid, membranes…)

III. Non-Specific

A. Chemical Signals1. Attract immune cells to site2. Make blood vessels leaky

B. Phagocyte1. Eats anything not marked as you

C. Inflammation1. Massive increase in blood flow

i. Warm and SwellingD. Fever

1. Used to kill germs by cooking them

IV. SpecificA. T-Lymphocytes (T-Cells)

1. Recognize specific germs (antigens)2. Destroy cells if infected

B. B-Lymphocytes (B-Cells)1. Produce antibodies

i. Mark and clump germs together

V. Damage and DiseaseA. Immunodeficiency

1. Lack of sleep2. Poor nutrition3. Lack of exercise4. Aging5. Organ transplanting

B. Allergies1. Body attacks object as dangerous threat

i. Foodsii. Oilsiii. Venom

C. Autoimmune Disease1. Body attacks own cells (overactive)

i. LUPUSii. Arthritisiii. Diabetes

D. AIDS1. Human Immunodeficiency Virus (HIV)

i. Kills T cellsii. Die from lack of immune systemiii. Transmitted by body fluids

VI. PreventionA. Active Immunity

1. Get sick (body stores up lymphocytes2. Vaccination (inject with weakened pathogen)

B. Intervention1. Antibiotics (Kill bacteria)

C. Passive Immunity1. Mother to child