Which of the following helps maintain a high solute concentration in the kidney medulla?
A. high urea concentration in medulla
B. active transport of solutes from ascending limb
C. the vasa recta
D. functions of the loop of Henle
E. All of these choices are correct
E
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In the testes, ________ cells provide nourishment for the germ cells.
Fill in the blank(s) with the appropriate word(s).
Which of the following is not an anatomical component of a synovial joint?
A) Articular cartilage B) The interosseous membrane C) The synovial membrane D) The fibrous capsule E) The joint cavity
Positron emission tomography (PET) imaging follows the emission of
A. electrons. B. neutrons. C. protons. D. positrons.
Glucagon
a. decreases blood glucose levels b. increases breakdown of fats c. increases glycogenesis in the liver d. increases amino acid uptake by cells e. increases Ca2+ reabsorption by the renal tubules