Define arrow. arrow synonyms, arrow pronunciation, arrow translation, English dictionary definition of arrow. n. 1. A missile having a straight thin shaft with a pointed head at one end and often flight-stabilizing vanes at the other, meant to be shot from a bow.
FSH stimulates the growth and recruitment of immature ovarian follicles in the ovary. In early (small) antral follicles, FSH is the major survival factor that rescues the small antral follicles (2â5 mm in diameter for humans) from apoptosis (programmed death of the somatic cells of the follicle and oocyte).
Approximately 10 ovarian follicles begin to mature in during a normal menstrual cycle and out of these usually one will turn into a dominant ovarian follicle. During ovulation, the primary follicle forms the secondary follicle and then the mature vesicular follicle.