Gonadotropin-releasing hormone is secreted by
a. the testes.
b. the anterior pituitary.
c. the ovaries.
d. the adrenal gland.
e. the hypothalamus.
Answer: e. the hypothalamus.
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Combinations of atoms that contain two or more different elements are called
A) molecules. B) compounds. C) mixtures. D) isotopes. E) None of these is correct.
ohn, a 72-year-old grandfather, had been smoking heavily for 24 years and had a persistent cough. A biopsy of his lung tissue revealed considerable amounts of carbon particles. How could this happen considering the natural cleaning mechanism of the respiratory system?
What will be an ideal response?
The papillary muscles attach to the cusps of the atrioventricular valves by means of the
A. tricuspid valve. B. pectinate muscles. C. trabeculae carneae. D. tendinous cords. E. conus arteriosus.
Which class of antibodies are commonly called gamma globulin?
A. IgM B. IgE C. IgG D. IgA E. IgD