Fighting Diseases

A infectious disease is a disease that....

• is caught because the weather turns cold

• is caused by pathogens

• can be spread only by bacteria

• cannot be cured

Louis Pasteur demonstrated that killing organisms that cause a disease could ....

• prevent the spread of that disease

• be accomplished only with antibiotics

• be accomplished only with over-the-counter medications

• make a person sick with that disease

How are colds and flu usually spread?

• by cold weather

• through an animal bite

• from pathogens that live naturally in the soil

• by direct or indirect contact with an infected person

Lyme disease is spred by.....

• coughing or sneezing

• eating contaminated food

• the bite of an infected tick

• drinking contaminated water

How do breathing passages help keep pathogens out of the body?

• chemicals kill some pathogens

• mucus and cilia trap some pathogens

• phagocytes in the breathing passages destroy pathogens

• they produce antibodies that kill pathogens

A cut in the skin can lead to an infection because....

• it interferes with the immune system's ability to fight disease

• it allows pathogens to get into the body

• the cut destroys the cilia that remove bacteria

• the cut kills phagocytes

What type of white blood cells are part of the inflammatory response?

• phagocytes

• B cells

• T cells

• cilia

The inflammatory response is called a general defense because....

• it responds the same way to any kind of pathogen

• all the organ systems of the body are involved in it

• it kills every pathogen that gets into the body

• it is more effective than any of the body's other responses to defense

Which cells in the immune system identify pathogens and distinguish one pathogen from another?

• T cells

• B cells

• phagocytes

• red blood cells

Antibodies destroy pathogens by .......

• infecting T cells

• breaking the cell membranes of pathogens

• binding to antigens on the pathogens

• destroying phagocytes