Tachycardia is more common observed in phentolamine than prazosin because the former
A: has some M-agonist action
B: has some β1-agonist action
C: blocks postsynaptic α₂-receptors
D: blocks presynaptic α₂-receptors
E: stimulates heart directly
A: has some M-agonist action
B: has some β1-agonist action
C: blocks postsynaptic α₂-receptors
D: blocks presynaptic α₂-receptors
E: stimulates heart directly
举一反三
- A drug combine with the receptors and show its effects, the drug is called A: partial agonist B: agonist C: noncompetitive antagonist D: competitive antagonist E: blocker
- 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.
- Phentolamine<br/>may increase heart rate by targeting____. A: presynapticα2-adrenoceptors B: postsynapticα2-adrenoceptors C: cardiacβ-adrenoceptors D: cardiacα1-adrenoceptors E: vascularα1-adrenoceptors
- Prazosin can selectively block ( ). A: D1 receptors B: α1 adrenoceptors C: α2 adrenoceptors D: β1 adrenoceptors E: β2 adrenoceptors
- There are three conditions necessary to create a thunderstorm: air that has a tendency towards ____ some types of lifting action, and relatively high moisture content.