Muscle contractions of the uterine walls and ________ in the semen aid sperm cell movement through the uterus and uterine tubes.
A) estrogen
B) progestins
C) prostaglandins
D) epinephrine
Correct Answer:
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Q8: In fetal circulation the descending aorta carries
Q9: At the blastocyst stage, the cells are
Q11: The nuclei from the approaching sperm and
Q12: Labor is regulated by
A)negative feedback control.
B)positive feedback
Q14: An enzyme that sperm secretes that is
Q15: Human prenatal development takes _ weeks.
A)28
B)32
C)38
D)44
Q19: Embryonic stem cells are derived from the
A)outer
Q23: The cells of a blastocyst that help
Q31: The foramen ovale is an opening that
Q38: The ductus venosus is a fetal vessel
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