Repeated USMLE Questions Step 1- Review- 30

Q- Bronchoconstriction results from stimulation of which one of the following receptor types?

A- Alpha-1- adrenergic receptors

B- Beta-2- adrenergic receptors

C- M2 cholinergic receptors

D- M3 cholinergic receptors

D- M3 cholinergic receptors- They cause stimulation of bronchiolar smooth muscles which leads to bronchoconstriction and pulmonary obstructive symptoms. There are no alpha adrenergic or M2 receptors in the lungs. Beta-2-adrenergic receptors’ stimulation causes bronchodilation.



Q- A 72-year-old woman presents for her routine examination. She is healthy and exercising regularly. Her weight is 145 lb. and her height is 5’5. She has a family history of breast cancer. Her pulse is 70/min and blood pressure is 120/80. Her lipid panel is within normal limits.

Which one of the following is the most likely risk factor to develop atherosclerosis in this woman?

A- Age

B- Blood pressure

C- Exercise

D- Family history of breast cancer

E- Weight

A- Age- Her age is the only risk factor for her but her healthy lifestyle can negate this risk.



Q- Which one of the following cardiac conditions occurs in about 25% of patients with systemic lupus erythematosus (SLE)?

A- Aortic stenosis

B- Atrial hypertrophy

C- Pericarditis

D- Ventricular myxoma

C- Pericarditis- It is seen in 25% of patients with SLE. It is characterized by pleuritic chest pain and pericardial friction rub. Other choices can occur but not as common as pericarditis.



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