The Immune System

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Terms in this set (21)
a bacterium, virus, or other microorganism that can cause disease.
Image: Pathogens
Mechanical barriers
They line the respiratory, GI, urinary, and reproductive tracts. Mucous membranes secrete mucus, a slimy substance that traps pathogens. The membranes also have hair-like cilia.
Image: Mechanical barriers
The Human Body
Includes a number of mechanical, chemical, and other defenses against disease.
Image: The Human Body
If pathogens get past the mechanical barriers to intrusion ...
chemical barriers may stop them.
Image: If pathogens get past the mechanical barriers to intrusion ...
Chemical barriers
The characteristics of certain areas of the body that oppose colonization by microorganisms. The acidity of gastric juice, for example, prevents colonization by most disease-causing germs.
Image: Chemical barriers
a large white blood cell, occurring principally in connective tissue and in the bloodstream, that ingests foreign particles and infectious microorganisms by phagocytosis.
Image: Macrophages
Human beings are naturally resistant to ...
some diseases that affect other animals.
Image: Human beings are naturally resistant to ...
Some pathogens prefer the environment of ...
the human body as opposed to that of other animals.
Image: Some pathogens prefer the environment of ...
Lyme disease
A tick-borne disease that can have devastating consequences to human beings but remain dormant in animals. A rash is a symptom of the first stage.
Image: Lyme disease
Natural immunity
The body's natural resistance to certain diseases. Varies for individuals. Depends upon genetic characteristics and some of the natural chemical defenses.
Image: Natural immunity
Acquired active immunity
Get by having a disease and producing natural antibodies to it or by being vaccinated against the disease.
Image: Acquired active immunity
Dead or weakened disease, virus, or toxin that is injected into body so the body can recognize it and build a defense for it. Is sometimes called a "vaccine".
Image: Immunization
Acquired passive immunity
Immunity that has been developed in another person or species and given to you. May also be administered to lessen the chance of catching a disease or to lessen the severity of the course of the disease.
Image: Acquired passive immunity
Acquired immunodeficiency syndrome
Image: AIDS
Human immunodeficiency virus contracted through sexual contact, exchange of body fluids, or intravenous exposure. You can die from "opportunistic" infections due to lowered chemical immune system. No cure.
Image: HIV

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