#1
Which of the following is a positive chronotropic agent?
#2
In cardiac physiology, what is the term for the time interval between successive heartbeats?
#3
What is the normal range for resting heart rate in adults?
#4
Which ion plays a crucial role in the depolarization phase of the cardiac action potential?
#5
What is the primary function of a negative chronotropic agent?
#6
Which ion plays a crucial role in cardiac pacemaker activity?
#7
What is the primary site of action for digitalis glycosides in the heart?
#8
Which of the following drugs is commonly used to treat supraventricular arrhythmias by slowing AV nodal conduction?
#9
Which of the following factors can influence cardiac chronotropy?
#10
Which phase of the cardiac action potential is responsible for the pacemaker activity of the SA node?
#11
What effect does acetylcholine have on heart rate?
#12
Which neurotransmitter is released by sympathetic nerves to increase heart rate?
#13
What effect does sympathetic stimulation have on cardiac contractility?
#14
Which receptor subtype in the heart is primarily responsible for mediating the positive chronotropic effects of catecholamines?
#15
What is the mechanism of action of beta-blockers in the context of cardiac chronotropy?
#16