The embryo proper develops from thea. inner cell mass.b. trophoblast.c. blastocele.d. yolk sac.
The embryo proper develops from thea. inner cell mass.b. trophoblast.c. blastocele.d. yolk sac.
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Question
The embryo proper develops from the
a. inner cell mass.
b. trophoblast.
c. blastocele.
d. yolk sac.
Expert Solution
Step 1
The embryo is an early stage of a developing organism. Embryonic development is a part of the life cycle that occurs after fertilization and implantation. The embryo after completing gestation period develops into a mature offspring.
Step 2
Inner cell mass is also called embryoblast. It is a part of the developing embryo which gives rise to the foetus. It is formed before implantation of the embryo into the endometrium of the uterus. It is present inside the blastocoel/blastocele. The trophoblast surrounds the inner cell mass as it lies inside in the blastocoele.
Thus, the correct answer is option ‘a’.
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