Human Embryogenesis Quiz

What is the first step of human embryogenesis?

• Zygote undergoes cleavage

• Differentiation of cells

• Fertilization between egg and sperm

• Formation of the blastocyst

What does the zygote form after the first 12-to-24 hours?

• A blastocyst

• A gastrula

• A morula

• An embryo

During which process do cells begin to differentiate?

• Cleavage

• Gastrulation

• Blastulation

• Neurulation

What is the term used for the outer shell layer of cells during early embryogenesis?

• Ectoderm

• Endoderm

• Trophoblast

• Mesoderm

What does the inner cell mass eventually become?

• The yolk sac

• The amniotic sac

• The embryo

• The placenta

What are the three germ layers formed during gastrulation?

• Ectoderm, Mesoderm, Endoderm

• Epiblast, Hypoblast, Mesoblast

• Amnion, Chorion, Allantois

• Trophoblast, Embryoblast, Blastocyst

Which germ layer goes on to form the epidermis, brain, and nervous system?

• Endoderm

• Mesoderm

• Trophoblast

• Ectoderm

What is the significance of the notochord in embryogenesis?

• It forms the central nervous system

• It defines the major axis of the body

• It differentiates into the heart

• It becomes the digestive tract

What condition can result from the improper closure of the neural tube?

• Cystic fibrosis

• Down syndrome

• Spina bifida

• Tay-Sachs disease

Which vitamin is crucial to prevent neural tube defects?

• Vitamin B12

• Vitamin C

• Folic acid

• Vitamin A