159 cards
____ is the joining of a sperm and an ovum.
Fertilization is the joining of a ____.
Fertilization occurs in the ____ of the fallopian tube.
The sperm uses ____ enzymes to penetrate the corona radiata and zona pellucida.
Once the sperm contacts the oocyte’s plasma membrane, the sperm establishes the a____nd injects its pronucleus.
Once the sperm contacts the oocyte’s plasma membrane, the sperm establishes the acrosomal apparatus and injects its ____.
When the first sperm penetrates it causes a release of ____ ions.
Sperm's release of calcium ion upon penetration ____.
____ result from the fertilization of two eggs by two different sperm.
Fraternal (dizygotic) twins result from ____.
____ result from the splitting of a zygote in two.
Identical (monozygotic) twins result from ____.
Monozygotic twins can be classified by ____.
____ refers to the early divisions of cells in the embryo.
The zygote becomes a____fter the first cleavage because it is no longer unicellular.
The ____ becomes an embryo after the first cleavage because it is no longer unicellular.
The zygote becomes an embryo after the first cleavage because it is no longer ____.
____ results in cells that are capable of becoming any cell in the organism.
Indeterminate cleavage results in cells that are ____.
____ results in cells that are committed to differentiating into a specific cell type.
Determinate cleavage results in cells that are ____.
The ____ is a solid mass of cells seen in early zygote development.
The ____ has a fluid-filled center called a blastocoel.
The blastula (blastocyst) has a fluid-filled center called a ____.
The blastula (blastocyst) has two different structures: the ____.
The ____ has two different structures: the trophoblast and the inner cell mass.
The ____ of blastula becomes the placental structures.
The trophoblast of blastula becomes ____
The ____ of blastula becomes the developing organism.
The inner cell mass of blastula becomes ____
The ____ implants in the endometrial lining and forms the placenta.
The blastula implants in the ____ and forms the placenta.
The blastula implants in the endometrial lining and forms the ____.
The chorion contains ____ .
The c____ontains chorionic villi .
____ penetrates the endometrium and creates the interface between maternal and fetal blood.
Chorionic villi ____
Before the ____ is established, the embryo is supported by the yolk sac.
Before the placenta is established, the embryo is supported by the ____.
The ____ is involved in early fluid exchange between the embryo and the yolk sac.
The allantois is involved in ____ between the embryo and the yolk sac.
The ____ lies just inside the chorion and produces amniotic fluid.
The amnion lies just inside the ____.
The developing fetus is connected to the ____ via the umbilical cord.
The developing fetus is connected to the placenta via the ____.
During gastrulation, the ____ is formed with a blastopore at the end.
During gastrulation, the archenteron is formed with a ____ at the end.
During ____, the archenteron is formed with a blastopore at the end.
As the archenteron grows through the ____ it contacts the opposite side, establishing three primary germ layers.
As the archenteron grows through the blastocoel it contacts the opposite side, establishing ____ primary germ layers.
As the ____ grows through the blastocoel it contacts the opposite side, establishing three primary germ layers.
Three primary germ layers are ____.
The outermost germ layer is called the ____ .
The ____ germ layer is called the ectoderm .
The innermost germ layer is called the ____ .
The ____ germ layer is called the endoderm .
The middle germ layer is called the ____ .
The ____ germ layer is called the mesoderm .
The ectoderm develops into the ____.
The ____ develops into the hair, nail, skin, and nervous system.