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* Nbme 15... QUestions.. Help!!
  sukar - 04/21/13 21:50
  Can someone tell me the answer for this question...

4. A 72 year old man with poorly controlled hypertension is brought to the emergency department because of severe abdominal pain for 2 hours. He appears pale and lethargic. His pulse is 124/min, respirations are 16/min, and blood pressure is 95/60 mmHg. The lungs are clear to auscultation. An S4 is present. Abdominal examination shows guarding, rigidity, and a pulsatile periumblical mass. Which of the following additional findings is most likely in this patient?
a. Ankle brachial indices that are within normal limits
b. Aortic regurgitation
c. Asymmetric radial pusles
d. Blood pressure readings that are higher in the left upper extremeity than in the right
e. Decreased femoral pulses
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* Re:Nbme 15... QUestions.. Help!!
  b4 - 04/24/13 22:55
  1 AA-Cytoskeleton
2 BB-Binds cytoplasmic receptor
3 EE-Block virion release
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* Re:Nbme 15... QUestions.. Help!!
  sukar - 04/28/13 00:52
  22. A 48-year-old woman comes to the emergency department because of palpitations. Pulse is 180/min, and blood pressure is 104/68 mm Hg. ECG shows an atrioventricular (AV) nodal re-entrant tachycardia. Carotid sinus massage is performed and sinus rhythm is restored. Which of the following is the most likely mechanism of the termination of the tachycardia in this patient?
a. Activation of carotid chemoreceptors
b. Blockade of Beta-adrenergic receptors in the AV node
c. Blockade of L-type calcium channels in the AV node
d. Increased cardiac parasympathetic activity
e. Increased cardiac sympathetic activity

23. A 22-year-old man comes to the physician because of an 8-year history of episodes of yellow-tingled eyes. He is a medical student, and he says that he has noticed that the symptom occurs during studying for final exams and other periods of intense stress. He has had no pain. Physical examination shows mild scleral icterus. Serum studies show:
Bilirubin, total 3.2 mg/dL
Direct 0.4 mg/dL
Alkaline phosphatase 35 U/L
AST 16 U/L
ALT 15 U/L
Which of the following best explains this patientís signs?
a. Decreased conjugation of bilirubin
b. Hepatitis C virus
c. Increased hepatic copper concentration
d. Intermittent obstruction of the common bile duct
e. Surreptitious acetaminophen abuse

24. During an experiment of muscle contraction, intracellular calcium is decreased after a substance is administered to a muscle preparation obtained from an experimental animal. Which of the following best explains why contraction is inhibited in this case?
a. Acetylcholine release is increased
b. Depolarization along T tubules is enhanced
c. Myosin binding sites on actin remain covered by troponin C
d. Sodium influx is increased
e. Tropomyosin is detached from actin

28. A 6-year-old buy with severe mental retardation and choreoathetosis is being evaluated for Lesch-Nyhan syndrome. Leukocytes are obtained from an assay of hypoxanthine-guanine phosphoribosyltransferase at saturating concentrations of phosphoribosylpyrophosphate and varying concentrations of guanine. Results of the data are shown.
Guanine (nM) Velocity (Patient) umoles/min
0.06 0.26
0.2 0.60
0.5 1.1
1.0 1.4
2.0 1.7
4.0 1.8
8.0 1.9
20 2.0
200 2.0
Which of the following is the approximate Michaelis constant [km] (in mM) for guanine in this patient?
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