Multiple choice
1. The stomach:
Rotates 90° clockwise around its own longitudinal axis.
Has faster growth on its dorsal surface than on its ventral surface.
Forms as a diverticulum from the distal esophagus.
Is described by A and B, but not C.
Is described by A and C, but not B.
2. The tissues of the lungs, other than the components of the bronchial tree, are formed by:
Induction of surface ectoderm by underlying thoracic mesoderm.
Induction of splanchnic mesoderm by respiratory endoderm.
Induction of somatic mesoderm by respiratory endoderm.
Differentiation of the outer layers of the respiratory endoderm.
Migrating neural crest cells found on the posterior body wall.
3. The liver:
Originates as a diverticulum from the foregut region.
Serves as the origination of the ventral pancreatic bud and the gallbladder bud.
Contains hematopoietic and connective tissue cells derived from surrounding mesoderm.
Is described by A and B, but not C.
Is described by A, B, and C.
4. Surfactant is:
May be notably absent or significantly reduced in infants born prematurely.
A wetting agent that decreases the surface tension within alveoli.
Secreted no earlier than the seventh month in utero.
All of the above are correct.
Some of the above are true.
5. The original cephalic limb of the intestinal loop:
Is attached to the cloaca and becomes the descending colon and rectum.
Is attached to the stomach and becomes the small intestine.
After rotation and repositioning, differentiates into the ascending and transverse colon.
Is continuous with the yolk sac through the belly stalk.
Is described by none of the above.