Read the following passage describing events in a normal 28-day human menstrual cycle: "A rapid increase in the secretion of hormone [W] leads to its peak level at mid-cycle, which induces the rupture of structure [X] . Following this rupture, [X] transforms into a new structure called [Y] , which primarily secretes large amounts of hormone [Z] to maintain the endometrium." Identify [W] , [X] , [Y] , and [Z] from the

Step-by-step solution

During a normal menstrual cycle, the rapid secretion of Luteinizing Hormone (LH) leads to its maximum level during the mid-cycle (LH surge). This surge induces the rupture of the Graafian follicle, resulting in ovulation. Therefore, hormone [W] is LH and structure [X] is the Graafian follicle. After ovulation, the ruptured Graafian follicle transforms into the corpus luteum. Therefore, structure [Y] is the corpus luteum. The corpus luteum secretes large amounts of progesterone, which is essential for the maintenanc