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Reproductive System

Body system that produces, stores, nourishes, ad releases gametes


Male gonad that produces sperm and androgens.


Steroid hormone in males involved in the development of male reproductive structures.


Female gonad that produces ova and estrogens.


Steroid hormone in females involved in the development of the reproductive organs.


Period of rapid growth and sexual maturation during which the reproductive system becomes fully functional.


Reproductive gland that produces gametes and sex hormones.


External sac in which the testes are located.

Seminiferous Tubules

One of thousands of tiny tubules that make up the testes.


Principal male sex hormone that stimulates the development of many male sex characteristics.

Secondary Sex Characteristic

Sex characteristic that appears at puberty.


Structure in the male reproductive system attached to the seminiferous tubules in which sperm mature and are stored.

Vas Deferens

Tube that carries sperm from the epididymis to the urethra.

Seminal Fluid

Substance in which sperm are suspended that is produced by three glands in the abdominal cavity.


Combination of sperm and seminal fluid.


Tube through which urine is released from the body.


External male reproductive organ; the organ through which the urethra connects to the outside of the body in humans and certain other animals


Egg produced in an ovary.

Primary Follicle

Cluster of cells that surround an ovum and prepare it for release from the ovary.


Process that involves the release of a mature ovum from the ovary.

Fallopian Tube

One of two fluid-filled tubes in human females through which an ovum passes after its release from an ovary; location of fertilization.


ORgan lying between the Fallopian tubes and the vagina in which a fertilized ovum can develop.


Canal that leads from the uterus to the outside of the female body.


Period after which follicle development no longer occurs and a female is no longer capable of bearing a child.

Menstrual Cycle

Process that involves the development and release of an egg for fertilization and the preparation of the uterus to receive a fertilized egg.

Corpus Luteum

Name given to the follicle after ovulation because of its yellow appearance.


Steroid hormone released by the corpus luteum.


Last phase of the menstrual cycle during which the lining of the uterus along with blood and the unfertilized ovum are discharged through the vagina.


Fertilized egg cell.


Mitotic cell division of a zygote or early embryo.


Solid ball of cells that make up an embryo; in humans, this stage occurs four days after fertilization.


Hollow structure in early human embryonic development that results after the morula form a fluid-filled cavity in the center.


Process in early embryonic development in which the blastocyst attaches itself to the wall of the uterus and begins to grow inward.


Process of cell migration during which the primary germ layers are formed in an embryo.


Outermost primary germ layer in an animal embryo.


Middle primary germ layer in an animal embryo.


Innermost primary germ layer in an animal embryo


Membrane that surrounds and protects a developing embryo; in placental mammals such as humans, develops into the amniotic sac.


Outermost membrane surrounding a developing reptile, bird, or mammal embryo; forms the placenta in placental mammals.


Organ in placental mammals through which nutrients, oxygen carbon dioxide, and wastes are exchanged between embryo and mother.


Unborn young of an animal during the later stages of development; in humans, the name give to embryo after eight weeks of development.

Umbilical Cord

Contains two arteries and one vein, connects the fetus to the placenta.

Amniotic Sac

fluid-filled structure that cushions and protects the developing fetus in placental mammals such as humans.


Series of rhythmic contractions that cause the opening of the cervix of the uterus to expand so that it will be large enough to allow the baby to pass through.

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