Chapters 19 and 20: Reproductive System and Pregnancy, Growth, Development, and Genetics

Embryo

A prenatal stage of development from fertilization through the eighth week of development, when all of the rudiments of organs are present

Fertilization

Union of a secondary oocyte and a sperm cell

Fetus

Prenatal human after eight weeks of development

Gametes

A mature haploid male or female germ cell which is able to unite with another of the opposite sex in sexual reproduction to form a zygote

Gestation

The process or period of developing inside the uterus between conception and birth

Gonads

Testes and ovaries: produce gametes

Implantation

A fertilized egg attaches to and embeds within the uterine lining (endometrium)

Oocyte

Cell formed by oogenesis; egg cell in ovary

Oogenesis

Formation of an oocyte; beginning before birth and culminating in puberty through menopause

Ovulation

Release of an egg cell from a mature ovarian follicle

Semen

Fluid containing sperm cells and secretions discharged from the male reproductive tract at ejaculation

Sperm

Male gamete

Spermatogenesis

Sperm cell production

Zygote

Cell produced by the fusion of nuclei from an egg and sperm