18 Questions
What is the primary effect of noradrenaline on blood pressure?
It causes an increase in blood pressure due to stimulation of α1 receptors
What is the effect of noradrenaline on heart rate?
It causes an increase in heart rate due to stimulation of β1 receptors
What is the effect of prazosin on the action of noradrenaline on blood pressure?
It abolishes the effect of noradrenaline on blood pressure
What type of receptor is isoprenaline selective for?
Non-selective β-agonist
What is the effect of isoprenaline on heart rate before administering propranolol?
Increase in heart rate
What is the effect of noradrenaline on heart rate, considering the reflex response?
It causes a decrease in heart rate
What is the primary mechanism of action of isoprenaline?
It stimulates β1 and β2 receptors
What is the primary function of propranolol in the experiment?
Blocking β receptors
What is the effect of isoprenaline on blood pressure before administering propranolol?
Decrease in blood pressure
What is the mechanism of action of adrenaline (epinephrine)?
Direct binding to all types of adrenergic receptors
What is the purpose of administering prazosin in the experiment with adrenaline?
To block α1 receptors
What is the effect of isoprenaline on blood pressure and heart rate after administering propranolol?
No change in blood pressure and heart rate
What is the effect of a large dose of adrenaline on blood pressure after administering prazosin?
It decreases blood pressure due to the stimulation of β2 receptors.
What is the reason for the increase in heart rate after administering a large dose of adrenaline after prazosin?
Stimulation of β1 receptors.
What is the effect of propranolol on the heart rate?
It decreases heart rate due to the blockade of β1 receptors.
What is the response of blood pressure to a large dose of adrenaline after administering propranolol?
It increases blood pressure due to the stimulation of α1 receptors.
Why is there no biphasic response of adrenaline after administering prazosin?
Because prazosin blocks only α1 receptors.
What is the purpose of administering propranolol before administering adrenaline in the experiment?
To block β1 receptors and study their effect on heart rate.
This quiz explores the effects of different autonomic drugs on blood pressure and heart rate, including noradrenaline and its mechanism of action on adrenergic receptors. It also involves experiments to record observations on the administration of these drugs. Test your knowledge of pharmacology and physiology!
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