Which of the following effects of adrenaline would be block the by phentolamine but not by propanonol: (A) Cardiac stimulation, (B) Relaxation of bronchial smooth muscle, (C) Relaxation of uterus, (D) Contraction of radiap smooth muscle in the iris
Answer is D. Ref-KDT 6/e p123 Smooth muscle of iris contain alpha receptor whereas hea,bronchus and uterus possess ba-adrenergic receptor