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Increased estrogen leads to a decrease in FSH due to negative feedback
Increase in the number of granulosa cells
Increase in gap junctions between granulosa cells and oocyte
Increase in FSH receptors on granulosa cells
Increased E2 production by granulosa cells
Follicles release AMH, leading to proliferation of nearby folicles
The Luteal Phase, like an Express Train, follows a predictable course, avoiding unneccesary delays.
Other stuff about the Luteal Phase...
If not enough "hormone" is produced at this point in the cycle, a delay of several days is common.
This is the cause of abnormal uterine bleeding in patients with Disorder.
Increase in Inhibin-B leads to a decrease in FSH via negative feedback.
Antral follicles release Inhibin-B
Like a train running a Local Service, the Follicular Phase can vary in length depending on the number of stops added to the route.
The time required to "get Hormone levels sufficiently elevated" to reach the next station can vary from person to person. This is one of the main reasons for menstrual cycle length variability.