Which of the male accessory glands encircles the urethra?
A. Seminal vesicle
B. Bulbourethral gland
C. Prostate gland
D. Cowper's gland
E. Urethral gland
C
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The amnion is one of the extraembryonic membranes, and its function is to
A. give the embryo nourishment. B. form the plasma portion of the blood. C. prevent desiccation of the embryo. D. permit implantation to occur. E. allow fluid to enter the placenta.
Which labeled structure in the figure is the AV node?
a) A b) B c) C d) D e) E
The myelin sheaths that surround the axons of some of the neurons in the CNS are formed by
A) astrocytes. B) Schwann cells. C) oligodendrocytes. D) microglia. E) ependymal cells.
What is a hereditary hemoglobin defect characterized by abnormally-shaped cells and anemia?
A. Cystic fibrosis B. Septicemia C. Hemophilia D. Sickle-cell disease E. Polycythemia