Match each term with its definition or description.
-Term for the solid mass of cells formed by the fertilized egg about three days after fertilization
A)Zygote
B)Morula
C)Blastocyst
D)Placenta
E)Fetus
F)Embryo
G)Ectoderm
H)Mesoderm
I)Endoderm
J)Histogenesis
K)Amniotic cavity
L)Implantation
M)Organogenesis
N)Fertilization
O)Yolk sac

Question

Quizplus · Accepted Answer

The morula is the term for the solid mass of cells formed by the fertilized egg about three days after fertilization.

Answer: A 
 The zygote is the fertilized egg, formed when sperm and egg unite.

Answer: C 
 The blastocyst is the hollow ball of cells that forms about five days after fertilization, and it is composed of an outer layer of cells (the trophoblast) that will become part of the placenta, and an inner cell mass that will become the embryo.

Answer: D 
 The placenta is the organ that exchanges oxygen, nutrients, and waste products between the developing fetus and the mother.

Answer: E 
 The fetus is the developing embryo after the eighth week of gestation until birth.

Answer: F 
 The embryo is the developing organism from the time of fertilization until the end of the eighth week of gestation, when it becomes a fetus.

Answer: G 
 The ectoderm is one of the three primary germ layers of the embryo, and it forms the skin, hair, nails, and nervous system.

Answer: H 
 The mesoderm is one of the three primary germ layers of the embryo, and it forms the muscles, bones, blood, urogenital system, and connective tissues.

Answer: I 
 The endoderm is one of the three primary germ layers of the embryo, and it forms the lining of the digestive and respiratory tracts and their associated organs.

Answer: J 
 Histogenesis is the process of differentiation and specialization of cells and tissues during embryonic development.

Answer: K 
 The amniotic cavity is the fluid-filled cavity that surrounds and protects the developing embryo/fetus.

Answer: L 
 Implantation is the process by which the blastocyst attaches to the endometrial lining of the uterus and begins to grow into the placenta and the embryo.

Answer: M 
 Organogenesis is the process of development during which the organs and organ systems of the body take shape and become functional.

Answer: N 
 Fertilization is the process by which the sperm and egg unite to form a zygote.

Answer: O 
 The yolk sac is the membranous sac that forms in early embryonic development and that provides nourishment to the developing embryo until the placenta takes over this function.

Match Each Term with Its Definition or Description