This figure shows an example of regulation of hormone secretion by a negative feedback loop. The large box labeled 1 represents the initial stimulus. Which could be the initial stimulus for this pattern of regulation?
A. Low RBC (red blood cell) count
B. Low body temperature
C. Low blood sugar level
D. High blood calcium level
E. High WBC (white blood cell) count
Answer: B
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A) gastrectomy B) colectomy C) enterorrhaphy D) enterectomy E) colorrhaphy
Which muscle inserts onto the distal phalanx of the thumb?
A) extensor indicis B) abductor pollicis longus C) extensor digitorum D) flexor pollicis longus
When deoxygenated blood leaves the right ventricle through a semilunar valve, it is forced into the __________.
a. pulmonary veins b. pulmonary arteries c. aortic arch d. lung capillaries
In birds, the hypothalamus does not
a. stimulate shivering. b. stimulate panting. c. stimulate erection of plumage. d. none of these.