Repeated USMLE Questions Step 1- Review- 83

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Q- A patient with a family history of myocardial infarction and congestive heart failure is advised to add cold water fish oil to his diet. Which of the following is the action of fish oil to reduce his risk for developing ischemic heart disease?

A- It enhances fatty acid metabolism

B- It reduces arachidonic acid metabolites and platelet aggregation

C- It reduces the absorption of cholesterol from the intestine

B- It reduces arachidonic acid metabolites and platelet aggregation- Leptin enhances fatty acid metabolism. Soluble fiber reduces cholesterol absorption.



Q- Which of the following is the reason that secondary tuberculosis often causes cavities in the apex of the lung, rather than the base?

A- Better perfused

B- Higher PO2

C- More acidic

D- More alveolar macrophages

B- Higher PO2- This is a favor environment for Mycobacterium TB leading to reactivation of old TB infection. Apex of the lung is less acidic than the base.



Q- Which one of the following pulmonary conditions is commonly associated with cystic fibrosis?

A- Adenocarcinoma

B- Bronchiectasis

C- Pleural fibrous plaques

D- Pneumothorax

B- Bronchiectasis- Sweat chloride is diagnostic test for cystic fibrosis. CF leads to development of multiple lung infections which lead to inflammation, obstruction, dilation and destruction of bronchi leading to bronchiectasis.



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2 thoughts on “Repeated USMLE Questions Step 1- Review- 83”

  1. In the review book 1, there are 300 questions.

  2. how many questions are there in the book

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