Some of the embryo's intestines remain within the umbilical cord during the embryonic period because the
a. Umbilical cord is much larger at this time than it will be at the end of pregnancy.
b. Intestines begin their development within the umbilical cord.
c. Nutrient content of the blood is higher in this location.
d. Abdomen is too small to contain all the organs while they are developing.
D
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A The intestines remain within the umbilical cord only until approximately week
10 .
B Intestines begin their development within the umbilical cord, but only because
the liver and kidneys occupy most of the abdominal cavity. All the intestines are
within the abdominal cavity around week 10 .
C Blood supply is adequate in all areas. Intestines stay in the umbilical cord for
approximately 10 weeks because they are growing faster than the abdomen.
D 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.
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