ANATOMY

Detailed explanation-1: -The yolk is completely formed in the ovary.

Detailed explanation-2: -Ooplasm. Ooplasm (also: oöplasm) is the yolk of the ovum, a cell substance at its center, which contains its nucleus, named the germinal vesicle, and the nucleolus, called the germinal disc.

Detailed explanation-3: -Vitellogenins (Vtgs) are the predominant egg yolk precursors in oviparous vertebrates. Vtgs are synthesized in the liver under the influence of estrogen, secreted into the bloodstream as  500 kDa homodimers, and bind specific receptors on the surface of growing oocytes during a process termed vitellogenesis.

Detailed explanation-4: -ovum, plural ova, in human physiology, single cell released from either of the female reproductive organs, the ovaries, which is capable of developing into a new organism when fertilized (united) with a sperm cell.

Detailed explanation-5: -At about day 14 in the menstrual cycle, a sudden surge in luteinizing hormone (LH) causes the ovary to release an egg (ovulation). The egg begins its travel through a narrow, hollow structure called the fallopian tube to the uterus.