When a couple has unprotected sexual intercourse 3 days before the woman ovulates, the risk of the woman becoming pregnant is:
Very low because that is not the woman's fertile period.
Uncertain because the ovum lives only for 24 hours.
Unknown because the ovum lives only for 24 hours.
Very low because the woman may not ovulate at all.
The Correct Answer is B
A. This statement is incorrect because sperm can survive inside the female reproductive tract for up to 5 days, meaning intercourse before ovulation can still result in pregnancy.
B. Uncertain is correct because while the egg does live only for about 24 hours after ovulation, sperm can survive for several days. Thus, intercourse 3 days before ovulation could still lead to pregnancy if sperm are still viable when the egg is released.
C. The ovum's survival time is generally known, so the risk is based on sperm viability and timing, not uncertainty about the egg.
D. While ovulation is necessary for conception, predicting it with certainty is not always possible, so this option is not entirely accurate.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. The umbilical cord typically contains two arteries that carry deoxygenated blood from the fetus to the placenta and one vein that carries oxygenated blood from the placenta to the fetus. This arrangement supports effective nutrient and gas exchange during fetal development.
B. Two veins are not found in the umbilical cord; only one vein is present.
C. While one artery and one vein might be seen in abnormal conditions like single umbilical artery (SUA), this is not typical.
D. Two veins and one artery is incorrect as the typical structure includes two arteries and one vein.
Correct Answer is C
Explanation
A. Relaxation of the uterine smooth muscle would decrease the force of contractions, which could slow labor rather than facilitate cervical dilation. Strong, coordinated uterine contractions are required to push the fetus downward.
B. Constriction of the cervical smooth muscle would prevent dilation, impeding the fetus’s passage through the birth canal. Cervical relaxation and thinning (effacement) are essential for labor progression.
C. Stretching of the pelvic smooth muscle allows the cervix to dilate and the fetus to descend into the pelvis and vaginal canal. This adaptation accommodates the fetal head and body, promoting safe and effective labor.
D. Contraction of the vaginal smooth muscle does not facilitate fetal descent; instead, relaxation of vaginal and perineal tissues is necessary to allow passage of the fetus. Vaginal tone increases resistance, so coordinated stretching is more important than contraction.
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