A fetus is nourished by way of a disc-shaped organ, the ________, attached to the uterine wall.
A. placenta
B. blastocyst
C. trophoblast
D. amnion
E. chorion
Answer: A
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The ductus venosus is a fetal vessel that transports blood from the umbilical vein to the
A. inferior vena cava. B. superior vena cava. C. aorta. D. umbilical artery.
The smallest muscle of the sural region that takes part in plantar flexion is the ________ muscle.
A) extensor hallucis longus B) plantaris C) gastrocnemius D) tibialis anterior E) soleus
The most commonly used oral contraceptives contain
A) synthetic androgen. B) gonadotropins. C) FSH and LH. D) synthetic estrogen and progesterone.
Stimulation of ?1 receptors present on smooth muscle cells of blood vessels to the skin by norepinephrine results in:
A) vasodilation. B) bronchodilation. C) vasoconstriction. D) sweating.