During the secretory phase, endometrial glands secrete a fluid rich in which nutrient, to sustain a fertilized egg if implantation occurs?

1. The secretory phase follows ovulation, driven by progesterone from the corpus luteum. 2. During this phase, the endometrial lining prepares to support a potential embryo. 3. The endometrial glands secrete a fluid rich in glycogen during this window. 4. Glucose alone and Fructose are both different figures a reader might guess from memory, but neither matches the specific figure given here. 5. Cholesterol is also incorrect for the same reason: it does not match the specific figure given here. 6. This glycogen-rich fluid nourishes the developing ball of cells if fertilization has occurred, not glucose, fructose, or cholesterol. _Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 27 "The Reproductive System", p.1304-1305 §Secretory Phase_