The extraembryonic membrane that forms the fetal portion of the placenta is the
A) yolk sac.
B) amnion.
C) allantois.
D) chorion.
E) decidua.
D
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Which of the following statements indicates the way in which the body's natural defenses protect the skin from the effects of UV damage?
A) The skin is protected by the synthesis of three pigments that contribute to the skin's color. B) Carotene, which accumulates in the stratum corneum and hypodermal adipose tissue, is synthesized in large amounts in the presence of sunlight. C) The skin is protected by increasing the number of epidermal dendritic cells, which help to activate the immune system. A) The skin is protected by the synthesis of three pigments that contribute to the skin's color. B) Carotene, which accumulates in the stratum corneum and hypodermal adipose tissue, is synthesized in large amounts in the presence of sunlight. C) The skin is protected by increasing the number of epidermal dendritic cells, which help to activate the immune system. D) Prolonged exposure to the sun induces melanin dispersion, which in turn acts as a natural sunscreen.
Which of the following would provide no benefit to a person suffering any one of the various types of anemia?
A) treatment with synthetic erythropoietin B) supplemental bilirubin injection C) supplemental oxygen delivered by mask D) blood transfusion
Which of the following abdominopelvic regions is medial and completely superior to the belly button?
a. hypochondriac b. umbilical c. hypogastric d. epigastric
____________________ RNA carries amino acids to the sites of protein synthesis in the cell
Fill in the blank(s) with correct word