Nokea
How many mature ova result from a single cycle of oogenesis?
- A. 1
- B. 2
- C. 3
- D. 4
Correct Answer: A
Rationale: Oogenesis produces one mature ovum per cycle, along with polar bodies that degenerate.
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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
Correct Answer: A
Rationale: The zona pellucida is a protective layer surrounding the ovum (egg cell). One of its primary functions is to prevent multiple sperm from fertilizing the egg by only allowing one sperm to penetrate and fertilize the ovum. This is crucial for ensuring that the resulting embryo has the correct genetic material (46 chromosomes) and does not have an abnormal number of chromosomes, which could lead to developmental issues. The zona pellucida acts as a physical barrier that helps to maintain the genetic integrity of the offspring.
What is the purpose of carrier screening in the first trimester?
- A. to check the positioning of the fetus
- B. to assess for chromosomal abnormalities in the fetus
- C. to measure the heart rate of the fetus
- D. to identify potential genetic disorders that parents may carry
Correct Answer: D
Rationale: Carrier screening identifies genetic disorders parents may carry, which can affect the baby. It does not check positioning, heart rate, or chromosomal abnormalities directly.
During pregnancy, which structure secretes hormones until the placenta takes over?
- A. Decidua basalis
- B. Chorionic villi
- C. Corpus luteum
- D. Syncytiotrophoblast
Correct Answer: C
Rationale: The corpus luteum produces hormones until the placenta takes over.
The nurse caring for a pregnant patient knows that her health teaching regarding fetal circulation has been effective when the patient reports that she has been sleeping:
- A. In a side-lying position.
- B. On her back with a pillow under her knees.
- C. With the head of the bed elevated.
- D. On her abdomen.
Correct Answer: A
Rationale: Optimal circulation is achieved when the woman is lying at rest on her side.
A woman who is 8 months pregnant asks the nurse, 'Does my baby have any antibodies to fight infection?' The most appropriate response by the nurse is:
- A. Your baby has all the immune globulins necessary: IgG, IgM, and IgA.
- B. Your baby won't receive any antibodies until he/she is born and you breastfeed him.
- C. Your baby does not have any antibodies to fight infection.
- D. Your baby has IgG and IgM.
Correct Answer: D
Rationale: During the third trimester, the fetus has IgG and IgM. Breastfeeding supplies the baby with IgA.