If you are exposed to hepatitis A and have not been vaccinated against it, you may receive antibodies from another person. This is an example of ________.
A. natural passive immunity
B. natural active immunity
C. artificial active immunity
D. artificial passive immunity
Answer: D
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Indicate whether the statement is true or false
What effect does histamine have?
a. reduced local edema b. increased erythrocyte proliferation c. reduced capillary permeability d. vasoconstriction e. vasodilation
In order to retain heat, what occurs in the skin on a cold day?
A. Blood vessels of the epidermis dilate. B. Blood vessels of the dermis constrict. C. Blood vessels of the dermis dilate. D. Blood vessels of the epidermis constrict.
Which of these blood types carries no antigens?
A) blood type A B) blood type B C) blood type AB D) blood types A, B, and AB E) blood type O