Healthcare

Administration of an experimental drug that acts on PNS myelin is shown  to increase the space constant of an axon in a peripheral nerve. Action   potentials traveling down the axon would be predicted to be

A 3-year-old child develops headaches and is brought to the family doctor.  Funduscopic examination reveals papilledema; one retina also shows a very   vascular tumor. CT of the head demonstrates a cystic tumor of the    cerebellum. This child has a high likelihood of later developing    which of the following?

A 3-year-old child is referred to a major medical center because of an  abdominal mass arising from his right adrenal gland. Biopsy of the lesion   demonstrates sheets of small cells with hyperchromatic nuclei containing    occasional pseudorosettes composed of circles of tumor cells with central     young nerve fibers arising from the tumor cells. Which of the following      oncogenes is associated with this patient's tumor?

A child who has had abnormal development of the membranous bones has a broad skull with associated facial and dental anomalies. Which other bones  are most likely to also be affected?

A 48-year-old female is being treated for breast carcinoma. Over the past  few days, she has been complaining of dysuria and frequency. Laboratory   examination revealed the presence of microscopic hematuria. The next day    the patient developed gross hematuria. Which of the following agents most     likely caused the development of these signs and symptoms?

Which of the following renal structures is most medially located?

An otherwise healthy 3-year-old child is brought to the pediatrician with  umbilicated, flesh-colored papules on his trunk. This condition is related   to infection with which of the following viruses?

A 30-year-old pregnant woman complains to her physician of feeling very  tired during her pregnancy. A complete blood count with differential   reveals a hematocrit of 30%, with hypersegmented neutrophils and large,    hypochromic red cells. Deficiency of which of the following would be     most likely to produce these findings?

A 27-year-old woman is giving birth. During the birth, the placental membranes tear and amniotic fluid is expressed into a lacerated cervical  vein. Which of the following is the woman most likely to experience   immediately following this event?

Molecular genetic studies are performed on a family with known familial hypercholesterolemia. In this particular family, the defect in the LDL receptor gene involves a messenger mutation near the 11th exon, in the region of homology with epidermal growth factor receptor precursor. A defect at this site would be most likely to produce which of the following  effects?