During the human menstrual cycle, coordinating hormones are released in a precise sequence involving both positive and negative feedback loops. Which of the following correctly identifies the endocrine source of oestrogen and its primary feedback effect during the late follicular phase, immediately preceding ovulation?
Source: Corpus luteum; Primary feedback effect: Negative feedback on the secretion of LH to prevent premature follicle development.
Source: Developing follicle; Primary feedback effect: Positive feedback on the secretion of LH to trigger ovulation.
Source: Anterior pituitary gland; Primary feedback effect: Positive feedback on FSH to promote multiple follicle maturity.
Source: Hypothalamus; Primary feedback effect: Negative feedback on GnRH to terminate the follicular phase.
