When does differentiation begin in a human embryo? day 4-5 day 10 day 25-26 day 50

Option). 4-5 days.

Explanation:

Morula is a 4-5 days stage of early embryonic development. It represents a solid ball, having 16 cells, known as blastomeres. In human embryo, differentiation begins with morula stage, along with cleavage to form trophoblast (an outer layers of cell) and inner cell mass.

During development, trophoblast forms embryonic part of placenta and inner cell mass form respective structures of embryo.

Thus, the correct answer is option).4-5 days.

Day 4-5

Explanation:

The first cell differentiation occurs when the embryo reaches approximately five days after fertilization, forming the blastocyst.

In this case, the cells on the outside undergo the process of differentiation and become responsible for the formation of embryonic attachments (structures that derive from the embryo's germ leaflets but are not part of the embryo's body, such as the amnion).

In the meantime, those cells that remained inside, also undergoing the process of differentiation, become pluripotent stem cells, which are responsible and capable of forming all tissues.

Previously, when they are still undergoing the process of dividing up to 8 cells, each cell is capable of forming a complete being when inserted into an egg.

By going through the whole process and becoming pluripotent stem cells, they can form all kinds of body tissues, but no longer a complete being.

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before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.