Textbook Question
What are the four extra-embryonic membranes?
28. Human Development
Extraembryonic Membrane Development
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The yolk sac goes on to do all of the following EXCEPT:
A
Form a portion of the digestive tract.
B
Produce early blood cells.
C
Produce early germ cells.
D
Form the umbilical cord.
Verified step by step guidance1
Understand the role of the yolk sac in embryonic development. The yolk sac is an important structure that contributes to the formation of various systems in the developing embryo.
Identify the functions of the yolk sac. It is known to form a portion of the digestive tract, produce early blood cells, and produce early germ cells.
Recognize that the yolk sac does not form the umbilical cord. The umbilical cord is formed from other embryonic structures, primarily the allantois and the connecting stalk.
Differentiate between the functions of the yolk sac and the structures involved in forming the umbilical cord. The umbilical cord is crucial for nutrient and waste exchange between the embryo and the placenta.
Conclude that the statement 'Form the umbilical cord' is the exception among the listed functions of the yolk sac, as it does not participate in this process.
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