Anatomy & Physiology Fundamentals Flashcards
7 cards from real Low Risk Neonatal Nurse Exam practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Anatomy & Physiology Fundamentals flashcards as text
The Moro reflex normally disappears at approximately what age?
Answer: 4 to 6 months
The Moro (startle) reflex typically fades by 4 to 6 months, and persistence beyond this may indicate neurologic problems.
Physiologic jaundice in a term newborn typically appears when?
Answer: After 24 hours, peaking around days 3 to 5
Physiologic jaundice appears after the first 24 hours and peaks at 3 to 5 days, whereas jaundice in the first 24 hours is pathologic.
Why are newborns at risk for vitamin K deficiency bleeding?
Answer: Their sterile gut lacks bacteria that synthesize vitamin K
The newborn intestine is sterile at birth, so vitamin K-producing flora are absent, and an injection is given prophylactically.
How does fetal hemoglobin differ from adult hemoglobin?
Answer: It has higher oxygen affinity
Fetal hemoglobin binds oxygen more tightly, allowing the fetus to extract oxygen from maternal blood across the placenta.
Which immunoglobulin crosses the placenta and gives passive immunity to the newborn?
Answer: IgG
IgG crosses the placenta, mostly in the third trimester, so preterm infants have lower passive immunity.
Elevated IgM in cord blood most strongly suggests what?
Answer: Intrauterine infection
IgM does not cross the placenta, so elevated levels indicate the fetus produced it in response to infection.
The posterior fontanelle usually closes at about what age?
Answer: 2 to 3 months
The posterior fontanelle closes by about 2 to 3 months, while the anterior closes at 12 to 18 months.
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