Thyroid hormone synthesis involves secretion of a glycoprotein called ________ by the follicular cells.
A. thyroxine
B. triiodothyronine
C. tetraiodothyronine
D. colloid
E. thyroglobulin
Answer: E
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Which of the following describes the distribution of sodium and potassium between cells and body fluids?
A) K+ mainly in the cells, Na+ in the body fluids B) Na+ mainly in the cells, K+ in the body fluids C) equal amounts of each ion in the cells and body fluids D) little of either in the cells, but large amounts of each in the body fluids
Which of the following statements best describes angular movements?
A) They change (increase or decrease) the angle between two bones. B) They occur only between bones with flat articular processes. C) They turn a bone along its own long axis. D) They allow movement only in one plane.
The main function of serous fluid is to
A. facilitate the diffusion of oxygen across the respiratory membrane. B. improve adhesion of the lungs to the thoracic wall. C. lubricate and reduce friction between pleural membranes around the lung.
What unit of bone consists of a central canal (containing blood vessels, nerves, and lymph vessels) surrounded by concentric rings of calcified matrix?
A. Osteocyte B. Canaliculus C. Osteon D. Lamella E. Trabeculum