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A blastocyst: A. Consists of trapho...

A blastocyst:
A. Consists of traphoectoderm
B. Includes Archenteron
C. Inner cell mass
D. includes blastecoel

A

A, B

B

A, B, C

C

C, D

D

A, C, D

Text Solution

AI Generated Solution

The correct Answer is:
To answer the question about the characteristics of a blastocyst, let's analyze each option step by step. ### Step 1: Understanding the Structure of a Blastocyst A blastocyst is a structure formed in the early stages of embryonic development, specifically during the blastula phase. It consists of an outer layer of cells and an inner cell mass. ### Step 2: Evaluating Each Option - **Option A: Consists of trophoblast (propoactoderm)** - The outer layer of the blastocyst is indeed called the trophoblast (or propoactoderm). This layer is crucial for implantation into the uterine wall. - **Conclusion**: This statement is **correct**. - **Option B: Includes Archenteron** - The archenteron is the cavity that forms during gastrulation and is associated with the development of the digestive tract. It is not present in the blastocyst stage. - **Conclusion**: This statement is **incorrect**. - **Option C: Inner cell mass** - The inner cell mass is a group of cells located inside the blastocyst that will eventually develop into the embryo. - **Conclusion**: This statement is **correct**. - **Option D: Includes blastocoel** - The blastocoel is the fluid-filled cavity within the blastocyst. It is an essential feature of the blastocyst structure. - **Conclusion**: This statement is **correct**. ### Step 3: Summarizing the Correct Options From the evaluations: - A is correct (trophoblast present) - B is incorrect (archenteron is not present) - C is correct (inner cell mass present) - D is correct (blastocoel present) ### Final Answer The correct options regarding the characteristics of a blastocyst are A, C, and D. Therefore, the answer is that the blastocyst consists of trophoblast, includes an inner cell mass, and includes a blastocoel.
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