After pretreatment with phentolamine, intravenous administration of epinephrine should result in a. Relaxation of bronchial smooth muscle b. Positive chronotropic and inotropic effects c. Splanchnic vasoconstriction d. Dilation of skeletal muscle vascular beds e. Secretion of a mucoid viscous saliva
a, b and d
a, and b only
a, d and e
c and d only
c, d and e
1 explanations
Angelok890
phentolamine is an alpha blocker, thus the epinephrine will stimulate beta receptors primarily, with the effects listed in option (ii): relaxation of bronchiolar smooth muscle (Beta-1), skeletal muscle vessel dilation (beta-2), and positiver chronotropic and inotropic action on the heart (b)
Angelok890