Question 1

Which of the following best describes the primary focus of embryology as presented in this course?

Accepted Answer

The study of the structural development of the human embryo

Question 2

During which week of embryonic development does gastrulation occur, resulting in the formation of the three primary germ layers?

Accepted Answer

Week 3

Question 3

A patient is found to have a congenital defect involving the vertebral column. Which embryonic structure is most directly responsible for the initial formation of the vertebral axis?

Accepted Answer

Notochord

Question 4

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

Accepted Answer

Mesoderm – heart and blood vessels

Question 5

A fertilized egg undergoes rapid mitotic divisions without increasing in overall size. What is the name of this process, and what is the resulting solid ball of cells called at day 3?

Accepted Answer

Cleavage; morula

Question 6

Which of the following best explains why the risk of birth defects is highest during the embryonic period (weeks 3–8)?

Accepted Answer

This is when all major organs and body structures are forming from the germ layers

Question 7

A researcher is studying the migration of mesenchymal cells during embryonic development. Which germ layer is primarily composed of mesenchyme and is capable of extensive migration?

Accepted Answer

Mesoderm

Question 8

Which of the following events marks the beginning of implantation?

Accepted Answer

The blastocyst attaching to and eroding the uterine lining

Question 9

A mutation affects the development of the neural crest cells. Which of the following structures is most likely to be affected?

Accepted Answer

Sensory ganglia of spinal nerves

Question 10

During which week does the embryo undergo significant folding to establish the general body form, including the formation of the primitive gut tube?

Accepted Answer

Week 4

Question 11

Which hormone, produced by the trophoblast after implantation, is the basis for most pregnancy tests?

Accepted Answer

Human Chorionic Gonadotropin (hCG)

Question 12

A 6-week-old embryo is found to have a defect in the lateral plate mesoderm. Which of the following structures is most likely to be affected?

Accepted Answer

Heart and blood vessels

Question 13

Which of the following best describes the fate of the notochord in the adult human body?

Accepted Answer

It persists as the nucleus pulposus of intervertebral discs

Question 14

A patient is diagnosed with an ectopic pregnancy in the ampulla of the uterine tube. Which of the following best describes an ectopic pregnancy?

Accepted Answer

Implantation of the blastocyst outside the uterine cavity, such as in the uterine tube

Question 15

Which of the following is the correct sequence of early embryonic development?

Accepted Answer

Zygote → Morula → Blastocyst → Gastrula

Question 16

A defect in the formation of somites would most likely affect which of the following adult structures?

Accepted Answer

Vertebrae and ribs

Question 17

Which of the following best explains why sperm deposited in the vagina can survive for up to 5 days, but generally start to wane after about 12 hours?

Accepted Answer

Only the healthiest sperm survive the journey and the female reproductive tract provides nutrients and protection for a limited time

Question 18

Which of the following best describes the function of the amniotic sac during embryonic development?

Accepted Answer

It acts as a buffer to protect the developing embryo and fetus from physical shock

Question 19

A medical student is asked to identify the germ layer that gives rise to the epithelial lining of the gastrointestinal and respiratory tracts. Which layer should they choose?

Accepted Answer

Endoderm

Question 20

Which of the following best describes the process of neurulation?

Accepted Answer

Formation of the neural tube from the thickened ectoderm overlying the notochord

Basic Human Embryology: An Anatomical Perspective

Guida di studio - Domande di pratica

Study guide - Flashcard