Prazosin can selectively block ( ). A: D1 receptors B: α1 adrenoceptors C: α2 adrenoceptors D: β1 adrenoceptors E: β2 adrenoceptors

Phentolamine<br/>may increase heart rate by targeting____. A: presynapticα2-adrenoceptors B: postsynapticα2-adrenoceptors C: cardiacβ-adrenoceptors D: cardiacα1-adrenoceptors E: vascularα1-adrenoceptors

Drug X is used in the treatment of cardiac arrhythmias. It is not recommended for use in asthmatic patients because of effects on certain adrenoceptors. This drug is probably A: procainamide B: propranolol C: quinidine D: lidocaine E: phenytonin

Which one of the sentence is INCORRECT for Prazosin? A: It is a selective α1 adrenoceptor blocker. B: It blocks presynaptic α2 adrenoceptors to increase release of noradrenaline. C: It has first dose of effect, showing postural hypotension. D: It dilates resistance and capacitance vessels. E: It can decrease the blood cholesterol concentrations.