Anatomy 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 💡 Explanation Which of the following effects of adrenaline would be block the by phentolamine but not by propanonol ✓ Correct Answer: D. Contraction of radiap smooth muscle in the iris