Chapter 10 Digestive System

Chapter 10  Digestive System

Complete Chapter Questions And Answers
 

Sample Questions

6. ________ Derived from the midgut loop
a.
Spleen
b.
Omphaloenteric duct (yolk stalk)
c.
Gallbladder
d.
Appendix
e.
Celiac trunk

ANS: D
The appendix is derived from the cecal diverticulum, an outpouching from the antimesenteric side of the midgut loop. The distal end of the cecum does not grow rapidly; thus, the appendix forms. At birth, the appendix is relatively longer than in the adult and is continuous with the apex of the cecum.

7. ________ Continuous with the apex of the midgut loop
a.
Spleen
b.
Omphaloenteric duct (yolk stalk)
c.
Gallbladder
d.
Appendix
e.
Celiac trunk

ANS: B
The omphaloenteric duct is attached to the apex of the midgut loop. The other end of this stalk is attached to the remnant of the umbilical vesicle (yolk sac), located near the placenta. The yolk stalk normally degenerates at the end of the embryonic period, but in about 2% of people, the proximal part of it persists as an ileal (Meckel) diverticulum.

8. ________ Organ derived solely from mesenchyme
a.
Spleen
b.
Omphaloenteric duct (yolk stalk)
c.
Gallbladder
d.
Appendix
e.
Celiac trunk

ANS: A
The spleen is derived from a condensation of mesenchymal cells between the layers of the dorsal mesogastrium. The splenic artery is a branch of the foregut (celiac) artery; this explains why it gives off pancreatic branches, short gastric arteries, and the left gastro-omental artery. Recall that the stomach and pancreas are foregut derivatives.

9. ________ Derived from foregut
a.
Spleen
b.
Omphaloenteric duct (yolk stalk)
c.
Gallbladder
d.
Appendix
e.
Celiac trunk

ANS: C
The gallbladder is derived from the foregut. The hepatic diverticulum from the foregut divides into two parts; the larger cranial part gives rise to the liver, and the caudal part gives rise to the gallbladder.