Question

Human embryonic development is the development and formation of the human embryo. It is characterized by the process of cell division and cellular differentiation of the embryo that occurs during the early stages of development. In biological terms, the development of the human body entails growth from a one-celled zygote to an adult human being. Choose ALL of the statements that correctly describe stages in human embryology and gestation.
The normal period of gestation is about 40 weeks.

The germinal stage refers to the time from fertilization through the development of the early embryo until implantation is completed in the uterus in about 21 days.

The stages of human development include, in order: zygote, blastocyst, embryo, and fetus

A blastocyst, if untouched and allowed to remain implanted, will eventually develop into a morula.

Changes to the form of the embryo come from differentiation and growth.

Answer 1

The statements that correctly describe gestation are: the normal period of gestation is about 40 weeks; the stages of this process include: zygote, blastocyst, embryo, and fetus; and changes to the form of the embryo come from differentiation and growth.

The gestation period in humans lasts about 40 weeks and comprises different stages and processes from conception until birth. The main stages of this process include:

• Zygote: Fertilized ovum.
• Blastocyst: Cluster of cells that is the result of the zygote going through cell division.
• Embryo: Unborn human that is still developing, usually before the 8th week of gestation.
• Fetus: Unborn human in development after the 8th week of gestation.

Moreover, this process implies differentiation as cells specialize for specific functions, for example, muscle cells or nerve cells, and growth as the number of cells increases and therefore the embryo or fetus increases in size.

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