Chapter 05: Conception and Prenatal Development Foundations of Maternal-Newborn & Women’s Health Nursing, 7th Edition. questions and correct answers.

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1. An expectant father asks the nurse, “Which part of the mature sperm contains the male chromosome?” What is the correct response by the nurse? a. X-bearing sperm b. The tail of the sperm c. ... The head of the sperm d. The middle portion of the sperm ANS: C The head of the sperm contains the male chromosomes that will join the chromosomes of the ovum. If an X-bearing sperm fertilizes the ovum, the baby will be female. The tail of the sperm helps propel the sperm toward the ovum. The middle portion of the sperm supplies energy for the tail’s whip-like action. DIF: Cognitive Level: Application OBJ: Nursing Process Step: Implementation MSC: Patient Needs: Health Promotion and Maintenance 2. One of the assessments performed in the birth room is checking the umbilical cord for blood vessels. Which finding is considered to be within normal limits? a. One artery and one vein b. Two veins and one artery c. Two arteries and one vein d. Two arteries and two veins ANS: C The umbilical cord contains two arteries and one vein to transport blood between the fetus and the placenta. Any option other than two arteries and one vein is considered abnormal and requires further assessment. Two veins and one artery is abnormal and may indicate an anomaly. Two arteries instead is a normal finding; this infant would require further assessment for anomalies due to the finding of two veins. DIF: Cognitive Level: Understanding OBJ: Nursing Process Step: Assessment MSC: Patient Needs: Health Promotion and Maintenance 3. What is the purpose of the ovum’s zona pellucida? a. Prevents multiple sperm from fertilizing the ovum b. Stimulates the ovum to begin mitotic cell division c. Allows the 46 chromosomes from each gamete to merge d. Makes a pathway for more than one sperm to reach the ovum ANS: A Fertilization causes the zona pellucida to change its chemical composition so that multiple sperm cannot fertilize the ovum. Mitotic cell division begins when the nuclei of the sperm and ovum unite. Each gamete (sperm and ovum) has only 23 chromosomes; there will be 46 chromosomes when they merge. Once sperm has entered the ovum, the zona pellucida changes to prevent other sperm from entering. [Show More]

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