Q- Which one of the following substances is released by sympathetic postganglionic neurons which innervate renal vascular smooth muscle?
A- Acetyl choline
B- Dopamine
C- Epinephrine
D- Norepinephrine
B-Dopamine- All sympathetic postganglionic neurons release norepinephrine except neurons in the sweat glands which release acetyl choline and the neurons in renal vascular smooth muscle which release dopamine.
Q- Which one of the following drugs is contraindicated in a case of osteoporosis?
A- Albuterol
B- Calcium oxalate
C- Prednisone
D- Simvastatin
C-Prednisone- All glucocorticoids including prednisone and cortisone inhibits bone formation and accelerate its resorption.
Q- Acetazolamide and other carbonic anhydrase inhibitors act at which part of the kidney?
A- Collecting duct
B- Descending loop of Henle
C- Distal tubule
D- Proximal tubule
D-Proximal tubule- These diuretics increase secretion of bicarbonate, sodium and potassium.
