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131788 Anatomy

A 35-year-old female is admitted to the emergency department because of cardiac arrhythmia. ECG examination reveals that the patient suffers from atrial fibrillation. Where is the mass of specialized conducting tissue that initiates the cardiac cycle located?

AAt the junction of the coronary sinus and the right atrium
BAt the junction of the inferior vena cava and the right atrium
CAt the junction of the superior vena cava and the right atrium
DBetween the left and right atria
Anatomy
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131796 Pathology

A 62-year-old man is a smoker with a 10-year history of cough productive of copious mucopurulent sputum. Over the past 6 months, he has developed progressive dyspnea. Physical examination shows bilateral pedal edema and a soft but enlarged liver. A chest radiograph shows bilateral pleural effusions and a prominent right heart border. Arterial blood gas values are PO2, 60 mm Hg; PCO2, 52 mm Hg; pH, 7.30; and HCO3-, 29 mEq/L. He is intubated and placed on a ventilator, and he requires increasing amounts of oxygen. Which of the following microscopic findings is most likely to be present in the affected lungs?

ABronchovascular distribution of granulomas
BCarcinoma filling lymphatic spaces
CExtensive interstitial fibrosis
DHypertrophy of bronchial submucosal glands
Pathology
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