One characteristic of the immune response is specificity. This means that ________
A) immunity is carried on by a specific group of tissues of the immune system
B) immunity is carried on by a specific group of cells of the immune system
C) immunity starts in defined organs in the body
D) immunity starts in specialized tissues in the body
E) immunity is directed against a particular pathogen
E
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Which of the following statements about positive and negative lymphocyte selection is TRUE?
A. In both instances, lymphocytes die after they do their job. B. In both instances, antigens do not recognize pathogens in the body. C. Only positive selection is needed for proper functioning of the immune system. D. It is necessary to have lymphocytes that can fight invaders without harming the body's own tissues.
A ________ receptor becomes active only when stimulated.
Fill in the blank(s) with the appropriate word(s).
Hypoventilation dramatically increases carbonic acid concentration and involves ________
A) extremely deep breathing B) extremely fast breathing C) extremely slow breathing D) intermittent breathing E) irregular breathing
The events that occur in the postabsorptive state collectively
A. decrease fat metabolism. B. maintain blood glucose levels. C. interconvert proteins to fats. D. assure adequate lipogenesis. E. maintain protein levels.