Sperm cells are stored for maturation in the
a. anterior pituitary
b. ductus deferens
c. epididymis
d. Leydig cells
e. urethra
C
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The microscopic cylindrical-shaped unit of compact bone is called the ________.
A. endosteum B. cancellous C. osteon D. trabeculae
Cholesterol-containing lipoproteins are cleared from the blood by which process?
A. Na+ gradient-dependent, secondary active transport B. Clathrin-dependent, receptor-mediated endocytosis C. Simple, transcellular membrane diffusion D. Hydrophobic phagocytosis E. Second messenger-activated, sterol transgenesis
A joint that permits free movement in only one direction is a
A) biaxial joint. B) monaxial joint. C) triaxial joint. D) syndesmosis. E) suture.
Hemoglobin
a. plays a critical role in determining the total amount of O2 that is exchanged because it acts as a storage depot, removing dissolved O2 and thus keeping the PO2 low so that net diffusion is allowed to continue. b. combines only with O2. c. is found in erythrocytes. d. both (a) and (c) above. e. all of these answers.