$$O_2$$\ content = (Hemoglobin\ concentration) \times (1.34) \times ($$O_2$$\ saturation) + (0.003 \times $$PaO_2$$)$$

Question 1

Which of the following best describes the sequence of early embryonic development from fertilization to implantation?

Accepted Answer

Fertilization → Zygote → Cleavage → Morula → Blastocyst → Implantation

Question 2

Which structure is responsible for forming the fetal portion of the placenta and secreting human chorionic gonadotropin (hCG)?

Accepted Answer

Trophoblast

Question 3

A patient presents with a neural tube defect. Which primary germ layer is most likely affected during embryonic development?

Accepted Answer

Ectoderm

Question 4

Which of the following is a major derivative of the mesoderm?

Accepted Answer

Skeletal muscle

Question 5

During gastrulation, which structure gives rise to the three primary germ layers?

Accepted Answer

Epiblast

Question 6

Which extraembryonic membrane is primarily responsible for gas exchange and forms the fetal blood vessels within the placenta?

Accepted Answer

Chorion

Question 7

A newborn is found to have only one umbilical artery instead of two. Which of the following is a possible consequence?

Accepted Answer

Reduced oxygen delivery to the fetus

Question 8

Which of the following best describes the function of the amnion?

Accepted Answer

Provides a fluid-filled cavity that cushions and protects the embryo

Question 9

Which of the following is TRUE regarding the placenta?

Accepted Answer

Nutrients and gases are exchanged across the chorionic villi

Question 10

Which of the following is derived from the endoderm?

Accepted Answer

Epithelial lining of the respiratory tract

Question 11

A researcher is studying the role of the chorionic villi. Which of the following best describes their function?

Accepted Answer

They increase the surface area for exchange between maternal and fetal blood

Question 12

Which of the following best explains why the yolk sac is important in early human development?

Accepted Answer

It is the site of early blood cell formation

Question 13

Which of the following is the correct formula for calculating the oxygen content delivered to the fetus via the umbilical vein?

Accepted Answer

$$O_2$$\ content = (Hemoglobin\ concentration) 	imes (1.34) 	imes ($$O_2$$\ saturation) + (0.003 	imes $$PaO_2$$)$$

Question 14

A mutation in the hypoblast would most likely affect which of the following?

Accepted Answer

Development of the yolk sac

Question 15

Which of the following best describes the role of the decidua basalis?

Accepted Answer

It forms the maternal portion of the placenta

Question 16

A fetus is diagnosed with a congenital heart defect. Which germ layer is most likely involved in this abnormality?

Accepted Answer

Mesoderm

Question 17

Which of the following is a function of the allantois during embryonic development?

Accepted Answer

Early blood formation and development of the urinary bladder

Question 18

Which of the following best explains why the umbilical vein carries oxygenated blood?

Accepted Answer

It transports blood from the placenta to the fetus

Question 19

Which of the following is a correct pairing of a germ layer and one of its derivatives?

Accepted Answer

Mesoderm – Blood vessels

Question 20

A medical student is asked to identify the structure that forms the primitive gut during embryogenesis. Which structure should they select?

Accepted Answer

Yolk sac

Embryonic Development: Key Structures and Processes

Study Guide - Practice Questions