Ovaries are almond-shaped, about the size of large walnuts, and produce egg cells(ova) and hormones. In oogenesis, a diploid reproductive cell divides meiotically to produce one mature egg cell (also called ovum). In animals, egg cells are also known as ova (singular ovum, from the latin word ovum meaning egg). The term ovule in animals is used for the young ovum of an animal. In vertebrates, ova are produced by female gonads (sexual glands) called ovaries. A number of ova are present at birth in mammals and mature via oogenesis. Disproved the longstanding dogma that all of the ova are produced before birth. Ovulation, release of a mature egg from the female ovary the release enables the egg to be fertilized by the male sperm cells. Normally, in humans, only one egg is released at one time occasionally, two or more erupt during the menstrual cycle. Choose from 500 different sets of termovum a mature egg cell. ) the female reproductive or germ cell which after fertilization is capable of developing into a new member of the same species called also egg. The term is sometimes applied to any stage of the fertilized germ cell during cleavage and even until hatching or birth of the new individual. 0039 inches in diameter, and contain many proteins and protein precursors. This is because when a sperm cell introduces its genetic information to that of the egg, the egg must respond quickly so that cell division may begin and a new organism may form. An immature egg has not undergone the necessary cell division to reduce the number of chromosomes in the nucleus of the egg from 46 chromosomes to 23 chromosomes. Immature eggs cannot be fertilized by sperm and will not produce a viable embryo.