Q- Which of the following is the most common cancer of the lower third of esophagus in non-alcoholic, non-smoker patients?
D- Squamous cell carcinoma.
Q- Which of the following muscles are responsible for primary abduction of the arm at the shoulder joint?
A- Coracobrachialis and deltoid
B- Deltoid and infraspinatus
C- Deltoid and supraspinatus
D- Supraspinatus and infraspinatus
Q- Which of the following is the cellular mechanism of epinephrine?
A- Activation of adenylyl cyclase
B- Activation of acetylcholinesterase
C- Activation of phospholipase
D- Inhibition of adenylyl cyclase
2 thoughts on “Repeated USMLE Questions Step 1- 357”
You are correct. I would ask for direct effect. Thanks Dr. Torres.
Epinephrine exerts effects on a1, b1, and b2. Alpha 1 receptors are Gq mediated and b1 and b2 are Gs mediated. Therefore, the correct answer choice would be a combination of adenylyl cyclase and phospholipase, no?