Exam 2 Review Questions

Question 1

In early heart formation, cells migrating through the anterior part of the primitive streak will form which of the following components of the heart?

A. Sinous venous

B. Atria

C. Ventricles

D. Outflow tract

Answer 1

D. Outflow tract

Question 2

In the early embryo, during somitogenesis, how many somitomere pairs are found caudal to the most caudal somite pair?

A. 6

B. 8

C. 12

D. 20

Answer 2

C. 12

(11?**)

Question 3

The wavefront (determination front) mechanism is related to which of the following?

A. Migration of epiblast cells through the primitive streak to form the cardiac crescent.

B. Opposing FGF-8 and retinoic acid gradients associated with somite formation.

C. Activation of mitosis in the cells that make up the myomere.

D. Segmentation of the intermediate mesoderm associated with kidney formation.

Answer 3

B. Opposing FGF-8 and retinoic acid gradients associated with somite formation.

Question 4

The sclerotome arises from cells that were located in which of the following?

A. Notochord

B. Paraxial mesoderm

C. Intermediate mesoderm

D. Lateral plate mesoderm

Answer 4

B. Paraxial mesoderm

Question 5

The cardiogenic plate arises from which of the following?

A. Embryonic endoderm

B. Somatic mesoderm

C. Splanchnic mesoderm

D. Intermediate mesoderm

E. Neural crest

Answer 5

C. Splanchnic mesoderm

Question 6

An inductive stimulus from which structure stimulates the transformation of the epithelial sclerotome into secondary mesenchyme?

A. Neural crest

B. Somite

C. Ectodermal placodes

D. Embryonic endoderm

E. Notochord

Answer 6

E. Notochord

Question 7

Which of the following structures in the embryo is unsegmented?

A. Somitomeres

B. Neuromeres

C. Notochord

D. Somites

Answer 7

C. Notochord

Question 8

The intermediate mesoderm is the precursor of which of the following?

A. Urogenital system

B. Heart

C. Somites

D. Body wall

E. Vertebral bodies

Answer 8

A. Urogenital system