Control And Order Of Heart Rate Including All The Nodes Flashcards
What is the primary function of the heart’s conduction system?
To control the heart rate and coordinate the contraction of heart muscles.
Which node is known as the natural pacemaker of the heart?
Sinoatrial (SA) node.
True or False: The atrioventricular (AV) node is located in the right atrium.
False.
Fill in the blank: The __________ node is responsible for delaying the electrical signal before it enters the ventricles.
Atrioventricular (AV)
What is the role of the Bundle of His?
To conduct impulses from the AV node to the ventricles.
Where are the Purkinje fibers located?
In the walls of the ventricles.
Multiple Choice: Which structure has the highest rate of depolarization?
A) SA node
What effect does the sympathetic nervous system have on heart rate?
It increases heart rate.
What effect does the parasympathetic nervous system have on heart rate?
It decreases heart rate.
True or False: The heart rate can be influenced by hormones such as adrenaline.
True.
What is the normal resting heart rate range for adults?
60 to 100 beats per minute.
Fill in the blank: The __________ node receives impulses from the SA node.
Atrioventricular (AV)
What is the term for the electrical pathway that spreads impulses through the ventricles?
Purkinje system.
Multiple Choice: Which of the following is not part of the conduction system of the heart? A) SA node B) AV node C) Aorta D) Bundle of His
C) Aorta
What is the primary ion that influences cardiac action potentials?
Sodium (Na+).
True or False: The heart can function independently of the nervous system.
True.
What is the term for the period of time when the heart muscle is relaxing?
Diastole.
What is the term for the period of time when the heart muscle is contracting?
Systole.
Fill in the blank: The __________ system releases neurotransmitters that affect heart rate.
Autonomic
What structure connects the atria and ventricles of the heart?
Atrioventricular (AV) bundle.
True or False: The heart’s conduction system is composed entirely of nervous tissue.
False.
What is the resting membrane potential of cardiac pacemaker cells?
-60 mV.
Multiple Choice: Which ion is primarily responsible for depolarization in cardiac action potentials? A) Calcium B) Sodium C) Potassium D) Chloride
B) Sodium
What is the function of the vagus nerve in heart rate control?
To decrease heart rate.
Fill in the blank: The __________ node initiates the electrical impulse that starts each heartbeat.
Sinoatrial (SA)
