An excess of hormones in the blood may cause target organs to decrease the number of receptors for that hormone in a process called __________.
A. negative feedback
B. receptor inhibition
C. down-regulation
D. positive feedback
Answer: C. down-regulation
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Generally, the shorter the half-life of a hormone
A. the more frequently it must be replaced. B. the less frequently it must be replaced.
Which of these is a special dietary adaptation of the colobines?
A) They have sacculated stomachs to help them digest leaves. B) They have modified incisors to help them gouge trees for sap. C) They have very long tongues so they can reach nectar inside flowers. D) They have developed immunity to most plant toxins.
The layer of loose connective tissue beneath the digestive epithelium is the
A) submucosal plexus. B) myenteric plexus. C) submucosa. D) muscularis mucosae. E) lamina propria.
Which of these is the best imaging technique for routinely examining the anatomical development of a fetus?
A. PET scan B. Sonography C. MRI D. Radiography E. Auscultation