Beginning of life
Terms in this set (21)
Fusion of an egg and sperm cell.
The moment at which a female becomes pregnant
The process by which the zygote attaches to the uterine wall.
A fertilized egg.
An organism in the earliest stage of development.
The developing human organism from 9 weeks after conception to birth.
A fluid-filled sac that cushions and protects a developing embryo and fetus in the uterus.
Fluid within the amniotic sac that surrounds and protects the fetus.
A cord that connects the mother's placenta to the fetus.
A structure that allows an embryo to be nourished with the mother's blood supply.
Solid ball of cells
Hollow ball of cells
The innermost membrane that encloses the embryo.
The outermost membrane surrounding the embryo or fetus.
Pregnancy involving implantation outside the uterus.
A pregnancy involving more than one fetus.
Twins resulting from two fertilized eggs that develop simultaneously.
An inability to conceive.
The deliberate control of pregnancy or birth.
Something designed to prevent a conception.
Twins resulting from one fertilized egg that divides in two.