The region known as the primitive streak is the site of
A) migration of mesodermal cells to form the endoderm.
B) endoderm formation.
C) ectoderm formation.
D) migration of ectodermal cells to form the mesoderm.
E) amnion formation.
Answer: D
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Select the correct statement about the physical factors influencing pulmonary ventilation.
A) A decrease in compliance causes an increase in ventilation. B) A lung that is less elastic will require less muscle action to perform adequate ventilation. C) As alveolar surface tension increases, additional muscle action will be required. D) Surfactant helps increase alveolar surface tension.
The separation of sister chromatids occurs during
A. anaphase. B. prophase. C. metaphase. D. telophase.
High levels of estrogen directly stimulate the LH-secreting cells of the anterior pituitary
Indicate whether the statement is true or false
Which of the following is NOT part of a portal triad?
A. Hepatic portal vein B. Central vein C. Hepatic artery D. Hepatic duct