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
D
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.
内容
- 0
Mike has some experience with computers because ________.
- 1
Both phentolamine and prazosin A: are competitive antagonist at α1 adrenergic receptors B: have potent direct vasoconstrictor actions on vascular smooth muscle C: enhance gastric acid secretion through a histamine -like effect D: cause hypotension and bradycardia E: are used chronically for the treatment of primary hypertension
- 2
It is common practice __________ a battery when it still has some life in it .
- 3
The air inside .a house on office building often has more contaminants（）the heavily polluted air outside. A: than does B: as C: as some that are D: than that of
- 4
It is common practice a battery when it still has some life in it.