Which of the following explains why the action of oxytocin increases during the last nine weeks of pregnancy?
a. The mechanism of action is dependent on the presence of estrogen.
b. The mechanism of action is dependent on the presence of progestin.
c. The mechanism of action is dependent on the size of the fetus.
d. The mechanism of action is dependent on the size of the uterus.
ANS: A
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A Correct: During the last trimester as estrogen levels rise, the uterine smooth muscle becomes more responsive to oxytocin.
B Incorrect: The relationship appears to be between estrogen and oxytocin.
C Incorrect: The relationship appears to be between estrogen and oxytocin.
D Incorrect: The relationship appears to be between estrogen and oxytocin.
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