Chapter 7.6 Hypersensitive Reactions Flashcards Preview

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Flashcards in Chapter 7.6 Hypersensitive Reactions Deck (17):

Define Allergies

Immune responses to normally harmless substances, found in 8-10% (1 in every 5) Americans. They are hypersensitivities to substances that ordinarily would do no harm to the body.


What is an immediate allergic response?

It can occur within seconds of contact with the antigen. This response is caused by antibodies known as IgE.


Describe asthma

Allergic reaction that results in airway obstruction.


Describe anaphylactic shock

Most severe type of allergic reaction; it can be lethal. It is a sudden life threatening drop in blood pressure due to increased permeability of the capillaries by histamine.


Describe delayed allergic response

It is initiated by memory T cells at the site of the allergen contact in the body.


Describe xenotransplantation

Transplanting animal (or lab made) organs into humans


Define autoimmune disorders

The powerful weapons of the immune system become unleased against normal body cells and proteins


Define rhuematoid arthritis

Macrophages, T and B cells target the synovial membranes of synovial joints. Genetic predisposition, possible role of pathogens


Define systemic Lupus Erythematosus

Development of antibodies in one owns DNA, can include arthritic component but can also affect many other systems


Define Deficient immune disorders

Conditions that lead to a drop in immune response


Define poorly controlled diabetes

Due to damage to small blood vessels, interfering with the delivery of blood components, will generally show poor resistance to infections


Define Lymphoma

Any cancers of lymphocytes; functions are greatly impaired or destroyed



Acquired immune deficiency syndrom-from HIV (human immunodeficiency virus) which attacks macrophages and helper T cells, patients usually eventually expire from opportunistic infections or rare forms of cancer


What are the infectious diseases that can overcome our defenses?

Virulence:refers to the relative ability of a pathogen to cause serious disease,


What are the patterns of occurrence?

1. Sporadic: irregular and limited outbreaks
2. Endemic: more or less continuous
3. Epidemic: outbreak that surpasses the predicted rate
4. Pandemic: when epidemics break out in several regions around the world in a given time span


Define antibiotics and antibiotic resistance

Antibiotics only kill certain bacteria, not viruses and antibiotics can kill friendly indigenous bacteria.


What is the resurgence of TB: Mycobacterium Tuberculosis

Has historically been a worldwide public health concern, In the U.S. the occurrence of new TB cases steadily decreased during the 20th century, however, since 1985, TB is making a comeback in the U.S. due to mainly new drug resistant TB scans.