Question

Gastrulation, when the cells organize themselves into an embryo occurs 2 weeks after conception. What do the 3 layers of cells go on to form?

A) Endoderm (Lower) - digestive and respiratory organs
B) Mesoderm (Middle) - muscles and circulatory system
C) Ectoderm (Top) - skin and nervous system
D) None of the above

Answer 1

A) Endoderm (Lower) - digestive and respiratory organs Gastrulation forms three germ layers: the endoderm, mesoderm, and ectoderm. The endoderm develops into digestive and respiratory organs, the mesoderm forms muscles and the circulatory system, and the ectoderm gives rise to the skin and nervous system.

Step-by-step explanation:

Gastrulation is a critical process in embryonic development that occurs around the second week after fertilization. This is when the cells of the embryo organize into three distinct layers known as the germ layers, each of which goes on to form different types of tissues and organs in the developing embryo. These germ layers are: The endoderm (inner layer), which will develop into the digestive and respiratory organs,. The mesoderm (middle layer), which will form the muscles, circulatory system, and other structures like bones and connective tissues The ectoderm (outer layer), which gives rise to the skin and nervous system,.

Therefore, the correct answer to the student's question is:A) Endoderm (lower): digestive and respiratory organsB) Mesoderm (middle): muscles and circulatory systemC) Ectoderm (top): skin and nervous systemGastrulation, which occurs during the third week after fertilization, is the process where the three germ layers form. The ectoderm develops into the skin and nervous system, while the mesoderm gives rise to muscles and the circulatory system. The endoderm forms the digestive and respiratory organs.