If a thyroid tumor secreted an excessive amount of calcitonin, we would expect ________.
A. a reduced rate of endochondral ossification
B. an elevated level of osteoblast activity
C. increasingly brittle bones
D. an elevated level of osteoclast activity
E. a rise in blood calcium concentration
Answer: B
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During embryonic development, blood vessels are formed by
a) endodermal cells. b) pluripotent stem cells. c) angioblasts. d) fibroblasts. e) osteoblasts.
________ inhibiting ______ secretion represents a long-loop negative feedback mechanism
a. Cortisol, CRH b. CRH, ACTH c. ACTH, CRH d. ACTH, cortisol e. CRH, cortisol
What is the effect of histamine release?
A) Histamine induces fever to accelerate tissue metabolism and defenses. B) Histamine increases local inflammation, increasing blood flow to the area. C) Histamine increases blood clotting and causes vasoconstriction to restrict blood loss. D) Histamine triggers the production of antiviral proteins in the cytoplasm of normal cells. E) Histamine binds to bacterial surfaces and enhances phagocytosis.
What is the principal cation of the ECF?
A) Pi B) Na+ C) Cl- D) K+ E) Ca2+