Final answer:
The statement about the release of estrogen by surrounding cells as eggs develop is true. Estrogen is essential for female reproductive development and the release of eggs. The start of the menstrual cycle (Day 1) is marked by menstruation, not ovulation, which usually occurs around Day 14.
Step-by-step explanation:
The statement about the eggs developing and surrounding cells releasing estrogen hormones into the bloodstream is true. During the ovarian cycle, as the eggs (oocytes) mature, the follicle cells that surround them produce and release estrogen. This hormone plays a critical role in the female reproductive cycle, causing the reproductive organs to develop during adolescence and facilitating the release of eggs during adulthood.
Regarding the menstrual cycle, it's important to clarify that Day 1 of the menstrual cycle is not when the secondary oocyte is released from its follicle. Instead, Day 1 marks the start of menstruation, which indicates the shedding of the uterine lining. Ovulation, which is when the secondary oocyte is released, typically occurs around Day 14 of a 28-day menstrual cycle.
Overall, estrogen alongside progesterone, regulates the menstrual cycle and prepares the endometrium for potential pregnancy after ovulation. Both of these hormones are crucial for maintaining the health and functionality of the female reproductive system.