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Topic: Immunity Aim: Explain some disorders of the immune system. Do Now: http://www.brainpop.com/health/disease sinjuriesandconditions/fluandfluvaccine/ HW: Castle Learning – Midterm due Friday at 8:00a.m. Allergies • Noninfectious • A reaction to HARMLESS substances (allergens) • Produces HISTAMINES which cause symptoms AIDS •Infectious •Acquired Immune Deficiency Syndrome • Caused by HIV (Human immunodeficiency virus) • Breaks down the immune system so that the body can’t fight off pathogens • Transmitted by: –Contact with infected blood –Sharing infected intravenous needles –Sexual contact with an infected person Cancer • Noninfectious • Abnormal cells grow & divide uncontrollably • May form tumors Review: 1. Explain allergies. 2. Explain why a person with AIDS dies from another infection. 3. Explain cancer. Infectious diseases are caused by a. deficiencies in the diet b. Allergies c. microscopic organisms that can be transmitted from one organism to another d. malfunctioning organs A person with AIDS is likely to develop infectious diseases because the virus that causes AIDS a. destroys cancerous cells b. damages the immune system c. increases the rate of antibody production d. increases the rate of microbe destruction In some individuals, the immune system attacks substances that are usually harmless, resulting in a. an allergic reaction b. a form of cancer c. an insulin imbalance d. a mutation