Multiple Choice
During which age range does the phallic stage of psychosexual development primarily occur in a child?
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28. Human Development
Introduction to Human Development
Multiple Choice
The zona pellucida surrounds which of the following structures during early human development?
A
Morula
B
Blastocyst
C
Gastrula
D
Oocyte
Verified step by step guidance1
Understand the role of the zona pellucida: The zona pellucida is a glycoprotein layer surrounding the plasma membrane of mammalian oocytes. It plays a crucial role in fertilization and early embryonic development.
Identify the stages of early human development: The stages include the oocyte, zygote, morula, blastocyst, and gastrula. Each stage has distinct characteristics and structures.
Recognize the structure associated with the zona pellucida: The zona pellucida is present around the oocyte before fertilization and remains until the blastocyst stage, where it facilitates implantation.
Differentiate between the stages: The morula is a solid ball of cells, the blastocyst is a hollow structure with an inner cell mass, and the gastrula is formed after implantation with distinct germ layers.
Conclude the association: The zona pellucida surrounds the oocyte initially and continues to play a role until the blastocyst stage, but it is not associated with the morula or gastrula stages.
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