What hormonal event immediately precedes and triggers the rupture of the dominant follicle during ovulation?
Answer
The LH surge
Ovulation, the release of the mature egg from the ovary, is directly precipitated by a sharp increase in luteinizing hormone (LH) released by the pituitary gland, an event termed the LH surge. This surge acts as the critical trigger, causing the dominant follicle that has matured under the influence of rising estrogen levels to rupture and expel the egg. This event marks the key fertility window of the entire cycle, occurring near the midpoint, contingent upon the preceding follicular phase length.
Related Questions
What event officially starts the entire menstrual cycle?Which two reproductive hormones primarily orchestrate the four main menstrual cycle phases?What hormonal event immediately precedes and triggers the rupture of the dominant follicle during ovulation?What is the typical duration, often around 14 days, for the luteal phase, the time between ovulation and the next period?Which of the four primary menstrual cycle phases is generally considered the most variable in length across different cycles?What specific range, in days, defines a cycle length considered normal for most adults?What is the typical range of days that the phase known as menstruation (bleeding) usually lasts?If fertilization does not occur, what happens to the corpus luteum after approximately ten to fourteen days?How can being significantly underweight, affecting Body Mass Index (BMI), potentially disrupt the regular cycle?What hormonal change associated with approaching perimenopause in the late 30s and early 40s can lead to shifts in cycle length?