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Repreductive System

Chapter 23

QuestionAnswer
fusion of male and female pronuclei fertilization
solid ball of embryonic cells morula
process of rapid mitotic cell division without intervening growth periods cleavage
combination of egg and sperm zygote
process involving cell rearrangement to form the three primary germ layers gastrulation
embryonic stage in which the embryo consists of a hollow ball of cells blastula
(Blank) embryonic stage in which the embryo consists of a hollow ball of cells ICM
(Blank)becomes the chorion and cooperates with the uterine tissue to form the placenta trophoblast
(Blank)produces the amnion, yolk sac, and allantois placenta
(Blank)produces the primordial germ cells (an embryonic membrane) epiblast
(Blank)an embryonic membrane that provides the structural basis for the body stalk or umbilical cord mesoderm
How many days after ovulation is implantation generally completed? six to seven days
. What event in the female menstrual cycle ordinarily occurs just about this time if implantation does not occur? miscarry
What name is given to the part of the uterine wall directly under the implanting embryo? endometrium
That surrounding the rest of the embryonic structure? amnion
Which two organ systems are extensively developed in the very young embryo? (blank)
the direction of development (blank)
When does the human embryo come to be called a fetus? In week number (blank)
What is the tissue origin of the placenta? (blank)
Define zygote A zygote is a fertilized egg that occurs after a sperm and egg fuse together. Zygotes contain 23 pairs of homologous chromosomes or diploid chromosome number of 46.
Cleavage is Cleavage is (embryology) the repeated division of a fertilized ovum.
Created by: What Homework?