A drug that enters the breast milk in concentrations equal to those in maternal serum is:

A. lobelia
B. methadone
C. lithium
D. alcohol

c
Rationale: Lithium enters breast milk in concentrations equal to those in maternal serum, and the baby may be exposed to relatively large amounts of this drug as a result.

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Atrial rhythms originate in the:

A) sino-atrial node. B) atrial pathways. C) atrioventricular node. D) AV junction.

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Spina bifida is MOST accurately defined as:

A. congenital inflammation of the spinal cord, usually in the neck. B. a birth defect caused by incomplete closure of the spinal column. C. a birth defect in which the child is born without spinal vertebrae. D. chronic pressure on the brain caused by excess cerebrospinal fluid.

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