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21.      Leukocytes ______. a.   white blood cells      c.   viruses b.   red blood

Question : 21.      Leukocytes ______. a.   white blood cells      c.   viruses b.   red blood : 1992064

21.      Leukocytes are ______.

a.   white blood cells      c.   viruses

b.   red blood cells      d.  bacteria

22.      Which of the following is a pathogen?

a.    white blood cells       c.   worn-out body cells

b.    leukocytes        d.   corticosteroids

23. Surface fragments on pathogens that cause leukocytes to produce antibodies to destroy them

are called ______.

a. antigens        c. endocrines

b. lymphocytes       d. platelets

24.      Leukocytes recognize invading pathogens by their ____________.

a.   sickle shape

b.   protein transport

c.   surface fragments

d.  ability to attach to red blood cells

25.  A lymphocyte is a type of ______.

a. pathogen       c. platelet

b. leukocyte       d. antigen

26.  _________ are a special type of “reserve” lymphocyte that can remain in the bloodstream

for years and form the basis for a quick immune response to an invader the second time around.

a. Reserve lymphocytes       c. Memory lymphocytes

b. Antigens        d. Antibodies

27.     Barbara has continuous colds during the winter.  A psychoneuroimmunologist

would contend that Barbara ______.

a.   has not been keeping herself warm enough

b.   has not been absorbing enough Vitamin C and sunshine

c.   has been too relaxed to activate her stress-combating white blood cells

d.   may have a weakened immune system due to prolonged stress

28. Which of the following statements is true?

a. Occasional mild stress actually strengthens the body’s immune system.

b. Persistent exposure to stress improves the effectiveness of memory lymphocytes.

c. Exposure to stress reduces symptoms associated with the body’s reaction to allergens.

d. Even relatively brief periods of stress can weaken the body’s immune system.

29.    Scientists recently discovered that chronic stress increases levels of ______, which may contribute to the physical health problems associated with psychological stress.

a.    inflammation        c.    hair growth

b.    immune system functioning   d. positive moods

30.      Prolonged stress has been linked to____________, which may contribute to asthma, arthritis, and cardiovascular disease.

a.    inflammation         c.    increased immune system functioning

b.


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