HUMAN REPRODUCTION
EPIDIDYMIS
tube that stores sperm
EMBYRO
A fertilized egg that has begun dividing into more cells
MARSUPIAL
A mammal, such as a koala, kangaroo, or opossum, whose young complete their embryonic development inside a maternal pouch called the marsupium.
SEXUAL REPRODUCTION
A reproductive process that involves two parents that combine their genetic material to produce a new organism, which differs from both parents
PLACENTA
A structure that allows an embryo to be nourished with the mother's blood supply
MONOTREME
Egg laying mammals
OVARIES
Egg-producing organs within the female reproductive system.
ZYGOTE
Fertilized egg
UTERUS
Hollow muscular organ in pelvic cavity where embryo is nourished and develops before birth
FETUS
In humans, the term for the developing organism between the embryonic stage and birth.
PENIS
Male reproductive organ
TESTES
Male reproductive organ that is the site for testosterone and sperm production
FERTILIZATION
Male sex cell (sperm) unites with female sex cell into one cell (46 chromosomes total with 23 from each gamete).
PLACENTAL MAMMAL
Mammal whose young develops inside the female uterus until it forms and ready to be born; has a placenta - a saclike organ- which supplies the embryo with food and oxygen and removes wastes.
VAGINA
Muscular passageway leading to the outside of the body. Called the birth canal, it extends from the vaginal opening to the cervix.
ASEXUAL REPRODUCTION
Process by which a single parent reproduces by itself
EXTERNAL FERTILIZATION
The process by which the female lays eggs and the male fertilizes them once they are outside of the female
FALLOPIAN TUBES
Tubes which carry eggs from ovaries to uterus and which provides the place where fertilization occurs
IDENTICAL
Twins who develop from a single fertilized egg that splits in two, creating two genetically identical organisms
FRATERNAL
Twins who develop from separate eggs. They are genetically no closer than brothers and sisters, but they share a fetal environment
MENSTRUATION
monthly changes that prepare a woman's body for pregnancy, discharge of blood and tissues from uterus
IMPLANTATION
process where a fertilized egg becomes implanted in the lining of the uterus
INTERNAL FERTILIZATION
the process by which the male places the sperm inside the females's body, where the eggs are fertilized