After about 3 days, the fertilized egg becomes a mass of cells called a:
a. zygote
b. morula
c. blastocyst
d. fetus
b. morula
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When maintaining homeostasis, it is important to do all of the following EXCEPT
A) detect external conditions. B) control external conditions. C) generate compensatory responses to the changes. D) protect vital areas from damaging changes.
The alar plate of the embryo develops into the gray commissure of the spinal cord
Indicate whether this statement is true or false.
Pepsinogen is an
A. active enzyme that is released in the small intestine and digests carbohydrates. B. inactive precursor to the enzyme pepsin that digests proteins in the stomach. C. active enzyme that digests proteins within the small intestine. D. inactive precursor to a nonspecific enzyme that is synthesized in the pancreas and released in the small intestine.
Fertilization generally occurs in the ________
A) uterus B) fallopian tubes C) vagina D) ovary