The quick response of the immune system to a second infection is due to
A. activation of macrophage cells.
B. suppression of suppressor cells.
C. T and B memory cells.
D. high levels of antigen.
E. new cytotoxic T cells.
C
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You observe a chimpanzee using a stick to dig termites out from a nest. The chimpanzee then eats the termites. This type of behavior is an example of ______________; the termites are the ______________
A. non-associative learning; stimulus B. habituation; signal C. sensitization; second stimulus D. operant conditioning; reward
If you had to increase hormonal secretions in a test subject, but you did not want to affect sodium levels, which two hormones could you use?
A. parathyroid hormone and atrial natriuretic peptide B. atrial natriuretic peptide and aldosterone C. aldosterone and cortisol D. atrial natriuretic peptide and cortisol E. antidiuretic hormone and cortisol
A goiter is caused by a deficiency in
a. thyroxine. b. triiodothyronine. c. calcium. d. iodine. e. both thyroxine and triiodothyronine
The number of new individuals added to the population by reproduction is called
A. morbidity. B. mortality. C. natality. D. exponential growth.