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Chapter 28


MULTIPLE CHOICE.  Choose the one alternative that best completes the statement 
or answers the question.

1)  Relaxin is a hormone produced by the placenta and ovaries. 
    The function of this hormone is to: 
    A)  block the pain of childbirth. 
    B)  ensure the implantation of the blastula. 
    C)  relax the pubic symphysis. 
    D)  prevent morning sickness. 

2)  Hormones concerned with events of lactation include: 
    A)  estrogen. 
    B)  oxytocin. 
    C)  progesterone. 
    D)  hCG. 

3)  Onset of labor may be a result of all of the following factors except: 
    A)  secretion of oxytocin. 
    B)  high estrogen levels. 
    C)  aspirin and similar drugs. 
    D)  increased emotional and physical stress. 

4)  Estrogen and progesterone maintain the integrity of the uterine lining and 
    prepare the mammary glands to secrete milk. Which of the following 
    structures makes this possible during the first three months of pregnancy? 
    A)  the amnion 
    B)  the chorion 
    C)  corpus luteum 
    D)  corona radiata 

5)  Which of the following is true in reference to what may pass through the 
    placental barriers? 
    A)  nutrients and respiratory gases only 
    B)  hormones, blood cells, and nutrients 
    C)  nutrients, respiratory gases, wastes, and alcohol 
    D)  respiratory gases, hormones, nutrients, and blood cells