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Allergies run in families because


A) the variable region of antibodies is genetically determined.
B) immunoglobulins pass from mother to fetus.
C) immunoglobulins pass through breast milk.
D) the relative production of IgE is inherited.

E) C) and D)
F) B) and D)

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A chronic,local allergy such as hay fever is considered ______.


A) antibody-mediated
B) atopic
C) systemic anaphylactic
D) delayed
E) T-cell-mediated

F) None of the above
G) B) and C)

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Histamine causes all of the following except


A) relaxation of vascular smooth muscle.
B) pruritis and headache.
C) increased sensitivity to pain.
D) wheal and flare reaction in skin.
E) constriction of smooth muscle of bronchi and the intestine.

F) A) and D)
G) A) and C)

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