COPY: Implantation and Development of the Embryo

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What is the primary function of the trophoblast enzymes during implantation?

To develop into the placenta

To produce blood cells

To break down tissue of the endometrium to obtain nutrients for the embryo (correct)

To form the chorionic villi

By the end of which week does the embryonic disc form the cylindrical neural tube?

5th week

2nd week

8th week

4th week (correct)

What is the term for the process of the formation of organs from the three primary germ layers?

Organogenesis (correct)

Morula formation

Cleavage

Gastrulation

Which layer of the embryonic disc gives rise to the nervous system?

Ectoderm Signup and view all the answers

What is the stage of development characterized by a solid ball of cells?

Morula Signup and view all the answers

During which stage does the inner cell mass flatten to form the embryonic disc?

Blastocyst stage Signup and view all the answers

What is the term for the movement of cells in the embryonic disc to form multiple layers?

Gastrulation Signup and view all the answers

Which primary germ layer produces the epithelial linings of the digestive tract and respiratory tract?

Endoderm Signup and view all the answers

What is the stage of development characterized by a hollow ball consisting of the trophoblast and inner cell mass?

Blastocyst Signup and view all the answers

During which stage does the heart start beating and limb buds form?

4th week Signup and view all the answers

During which stage of development does the mass of cells divide rapidly and become smaller?

Cleavage Signup and view all the answers

What is the term for the solid ball of approximately 16 cells that forms after cleavage?

Morula Signup and view all the answers

Which stage of development is characterized by the formation of the placenta and major organs?

Embryonic stage Signup and view all the answers

What is the term for the process of change through lifespan?

Development Signup and view all the answers

During which stage of development does the inner cell mass organize into the embryoblast?

Implantation Signup and view all the answers

What is the term for the hormone secreted by the trophoblast during implantation?

Human chorionic gonadotropin (hCG) Signup and view all the answers

What is the term for the structure that forms from cells that surround the embryo and cells from the endometrium?

Placenta Signup and view all the answers

During which stage of development does the zygote move down the uterine tube?

Cleavage Signup and view all the answers

What is the term for the process of fertilization resulting in the formation of a zygote?

Fertilization Signup and view all the answers

What is the term for the stage of development that lasts from fertilization to the 8th week?

Embryonic stage Signup and view all the answers

What is the term for the stage of development that begins at the end of the 8th week and lasts until birth?

Fetal stage Signup and view all the answers

By the end of which week are external reproductive organs distinguishable as male or female?

12th week Signup and view all the answers

During which month does the body grow quickly, and the lower limbs lengthen?

4th month Signup and view all the answers

What happens to the skin during the 6th month of fetal development?

It becomes wrinkled, translucent, and reddish Signup and view all the answers

During which trimester do brain cells form rapidly, and organs mature as the fetus greatly increases in size?

Third trimester Signup and view all the answers

How many days after fertilization is a baby typically full-term and ready for birth?

266 days Signup and view all the answers