After fertilization, the first cell division is completed
A) within a few seconds.
B) within the hour.
C) about 6 hours later.
D) in 12 hours.
E) more than a day later.
Answer: E
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The umbilical cord contains the yolk sac, the placental blood vessels and the
A) chorionic villi. B) allantois. C) amnion. D) chorion. E) decidua.
If one of your classmates comes down with mononucleosis, he will probably notice that his neck and axillary area are tender. A differential white count would reveal an unusually high level of one type of leukocyte
Which leukocyte proliferates and how does activation of this leukocyte change its appearance? How would this relate to the axillary tenderness? What will be an ideal response?
Identify the structure connecting the fetus to the placenta, and name the extra-embryonic membrane from which it is derived
A) yolk sac; allantois B) yolk sac; chorion C) umbilical cord; allantois D) umbilical cord; chorion E) umbilical cord; amnion
Diffusion rate across the respiratory membrane is rapid because ________.
A. alveoli are one cell thick B. there are about 750 square feet of alveoli membrane C. the air-blood barrier is two cells thick D. All of the choices are correct.