The binding of complement proteins to certain sugar or proteins on a foreign cell's surface is called ________
A) cellular immunity (cellular-mediated immunity)
B) complement fixation
C) positive chemotaxis
D) diapedesis
B
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People who work in factories that package buttered popcorn can develop a disorder
caused by inhaling organic dust. This disorder is called A) extrinsic allergic alveolitis. B) asbestosis. C) emphysema D) berylliosis
Sweating
a. causes vasodilation of the skin vessels. b. increases the insulative capacity of the skin so that less heat can be gained from the environment. c. is the only heat-loss mechanism available to the body when the environmental temperature is so high that a normal temperature gradient between the skin and the environment cannot be established. d. both (a) and (c) above. e. all of these answers.
Cells that are arranged in several layers are called ________ cells.
A. cuboidal B. stratified C. columnar D. squamous
The lumen of the gastrointestinal tract is continuous with the external environment
Indicate whether the statement is true or false.