Which feature distinguishes a mature, graafian follicle from a primary follicle? The presence of a(n):
a. Antrum
b. Granulosa layer of cells
c. Primary oocyte
d. Theca layer of cells
e. Zona pellucida
ANS: A
The appearance of a fluid-filled antrum distinguishes secondary and tertiary (graafian) follicles from primary follicles.
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