Topic: Immunity Aim: Explain some disorders of the immune system. Do Now: sinjuriesandconditions/fluandfluvaccine/ sinjuriesandconditions/fluandfluvaccine/ HW: Castle Learning – Midterm due Friday at 8:00a.m.

Infectious disease Caused by a pathogen Can be transmitted Example:

1. AIDS: 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

Noninfectious disease Not caused by a pathogen Cannot be transmitted Examples:

1. Allergies A reaction to HARMLESS substances (allergens) Produces HISTAMINES which cause symptoms

2. Cancer Noninfectious Abnormal cells grow & divide uncontrollably May form tumors

Let’s summarize…: 1.Explain the difference between infectious and noninfectious disease. 2.Identify and explain some examples of infectious diseases. 3.Identify and explain some examples of noninfectious diseases

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