The primary function of cell-mediated immunity is to
A) protect the body against extracellular parasites.
B) decrease the amount of complement.
C) destroy cancerous or virus-infected host cells.
D) increase the number of macrophages.
E) promote the production of antibodies.
C
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The attraction of leukocytes to the area on inflammation is referred to as
A. parasitism. B. infection. C. phototaxis. D. chemotaxis.
If two species of lizards do not mate because their mating rituals differ greatly, they are exhibiting ____ reproductive
isolation.
a. behavioral b. ecological c. gametic d. mechanical e. temporal
Answer the question using the accompanying figure. The constant region of a heavy chain is indicated by
number____.
a. 1 b. 2 c. 3 d. 4 e. 5
Breathing helps move blood from lower parts of the body toward the heart by which of the following mechanisms?
A) Inhalation increases the size of the thoracic cavity, which reduces pressure and draws blood toward the heart. B) Inhalation decreases pressure in the abdominal cavity, which opens veins and pushes blood toward the heart. C) Breathing does not help return blood to the heart. D) Inhalation increases the size of the thoracic cavity and increases pressure in the abdominal cavity.