Question 1

Which of the following best describes the basic body plan of adult humans as discussed in embryogenesis?

Accepted Answer

A tube within a tube, with a coelom separating the two

Question 2

What is the primary function of the coelom in the human body plan?

Accepted Answer

To allow organs to change in size and move independently

Question 3

During fertilization, where does the union of the egg and sperm typically occur?

Accepted Answer

In the ampulla of the fallopian tube

Question 4

Which of the following best describes the process of cleavage during early embryogenesis?

Accepted Answer

Rapid cell division without overall growth in embryo size

Question 5

What is the correct sequence of early embryonic development after fertilization?

Accepted Answer

Zygote → Morula → Blastocyst → Implantation

Question 6

Which structure forms the outer layer of the blastocyst and contributes to the placenta?

Accepted Answer

Trophoblast

Question 7

What is the main role of the serosa in the human body?

Accepted Answer

To line and protect internal body cavities and organs

Question 8

Which of the following statements about the peritoneum is correct?

Accepted Answer

It is a serous membrane associated with the abdominal cavity

Question 9

A patient has a condition where their organs cannot expand properly within the body cavity. Which embryological structure is most likely affected?

Accepted Answer

The coelom

Question 10

If the blastocyst fails to implant into the uterine wall, what is the most likely outcome?

Accepted Answer

The blastocyst will not survive and pregnancy will not occur

Question 11

Which of the following best explains why the surface-to-volume ratio increases during cleavage?

Accepted Answer

Cells divide without growing, creating more but smaller cells

Question 12

Which of the following is a correct description of the morula stage?

Accepted Answer

A solid ball of cells, usually with more than 16 cells

Question 13

Which of the following equations best represents the relationship between the number of cells ($$n) $$and the number of cleavage divisions ($$d) $$during early embryogenesis?

Accepted Answer

$$n = 2^d$$

Question 14

A researcher observes an embryo at the blastocyst stage. Which of the following features should be present?

Accepted Answer

A hollow ball with an inner cell mass and a fluid-filled cavity

Question 15

Which of the following best describes the fate of the inner cell mass in the blastocyst?

Accepted Answer

It gives rise to the embryo proper

Question 16

Which of the following is a function of the trophoblast during implantation?

Accepted Answer

It binds to the endometrium and initiates an inflammatory response

Question 17

If a mutation prevented the formation of the serosa, which of the following would most likely occur?

Accepted Answer

Organs would be unable to expand and contract properly

Question 18

Which of the following best explains why the kidneys are described as 'retroperitoneal'?

Accepted Answer

They are located behind the peritoneum

Question 19

A patient presents with a developmental abnormality where the blastocyst fails to form a cavity. Which stage of development is most likely affected?

Accepted Answer

Blastulation

Question 20

Which of the following best describes the role of uterine secretions before implantation?

Accepted Answer

They nourish the non-implanted blastocyst

Embryogenesis and the Human Body Plan: Foundations for Nutrition and Development

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