צרו קשר עוד היום





שאלות לדוגמה במבחן - USMLE

1. Just as he is about to throw the ball, a football player is struck in the arm, dislocating the head of the humerus anteriorly. A radiograph shows the humeral head resting against the coracoid process in the shoulder joint, and subsequent evaluation shows a tear in the anterior capsule of the glenohumeral joint. The tendon of which of the following muscles has been torn?

  • A. Infraspinatus
  • B. Subscapularis
  • C. Supraspinatus
  • D. Teres major
  • E. Teres minor

2. A 25-year-old woman presented with a 2-week history of numbness and weakness in her extremities, double vision, difficulty maintaining coordination while walking, and bladder control problems. Two days ago, she began experiencing dizziness and her speech became slurred. A magnetic resonance image (MRI) showed areas of demyelination in the brain suggestive of multiple sclerosis. What is the most likely pathomechanism involved?

  • A. Destruction of myelin sheaths by cytotoxic T cells
  • B. Granulomatous inflammation
  • C. Immune complex deposition
  • D. Lysis of peripheral neurons mediated by membrane attack complex
  • E. Viral encephalitis

3. A 9-month-old infant girl is brought to the pediatrician because of a severe coughing spasms that prevent inspiration and produce vomiting. She has no history of immunizations. Physical examination reveals a characteristic inspiratory whoop after each bout of coughing. These clinical symptoms result from what change in a signalling pathway?

  • A. Activation of a Gq protein
  • B. Activation of a Gs protein
  • C. Inactivation of a Gi protein
  • D. Inhibition of tyrosine phosphorylation
  • E. Stimulation of guanylyl cyclase activity

4. A 2-year old boy presented with a 3-week history of abdominal pain that suddenly worsened that morning and was accompanied by fever. Vital signs: temperature 39°C, heart rate 130 beats per minute, blood pressure 90/50 mm Hg, respirations 40 breaths per minute. Abdominal examination revealed a diffusely tender, distended abdomen with pain localizing to the right lower quadrant with guarding and rebound tenderness. The child was also found to have periorbital and bilateral ankle edema. Laboratory findings: white blood count (WBC) 20,000/μL with 17% bands; urine protein 3.5 g/L, serum albumin 1.4 g/dL, cholesterol 250 mg/dL. Abdominal computed tomography (CT) showed ascites and normal appendix. Analysis of ascitic fluid revealed albumin of 0.7 g/dL, numerous polymorphonuclear cells and Gram-positive diplococci. What was the most likely diagnosis?

  • A. Acinetobacter calcoaceticus
  • B. Bacteroides fragilis
  • C. Clostridium septicum
  • D. Escherichia coli
  • E. Streptococcus pneumoniae

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