Phentolamine
may increase heart rate by targeting____.
A: presynapticα2-adrenoceptors
B: postsynapticα2-adrenoceptors
C: cardiacβ-adrenoceptors
D: cardiacα1-adrenoceptors
E: vascularα1-adrenoceptors
may increase heart rate by targeting____.
A: presynapticα2-adrenoceptors
B: postsynapticα2-adrenoceptors
C: cardiacβ-adrenoceptors
D: cardiacα1-adrenoceptors
E: vascularα1-adrenoceptors
举一反三
- Prazosin can selectively block ( ). A: D1 receptors B: α1 adrenoceptors C: α2 adrenoceptors D: β1 adrenoceptors E: β2 adrenoceptors
- 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.
- 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
- Which of the following is wrong about the cardiac cycle? A: the diastolic period is longer than the systolic period B: The atria and ventricles contract at the same time C: The atria and ventricles can relax at the same time D: The length of cardiac cycle is related to heart rate
- 单选题<br/>Which<br/>of the following statements is the most consistent with the<br/>definition of heart failure? () A: Stroke volume is decreased B: The volume of venous return is greater than that of cardiac output C: Cardiac output cannot meet body’s requirement for metabolism D: Heart dysfunction results in congestion in pulmonary and systemic<br/>circulation