Some of the embryo's intestines remain within the umbilical cord during the embryonic period because the:
a. intestines need this time to grow until week 15.
b. nutrient content of the blood is higher in this location.
c. abdomen is too small to contain all the organs while they are developing.
d. umbilical cord is much larger at this time than it will be at the end of pregnancy.
ANS: C
The abdominal contents grow more rapidly than the abdominal cavity, so part of their development takes place in the umbilical cord. By 10 weeks, the abdomen is large enough to contain them. The intestines remain within the umbilical cord only until about week 10. Blood supply is adequate in all areas; intestines stay in the umbilical cord for about 10 weeks because they are growing faster than the abdomen. Intestines begin their development within the umbilical cord, but only because the liver and kidneys occupy most of the abdominal cavity, not because of the size of the umbilical cord.
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