CVRN HEART CONDUCTION SYSTEM EXAM
2025/2026 WITH 100% ACCURATE ANSWERS
1. The base of the heart is up by the 2nd intercostal space and the apex of
the heart is at the 5th intercostal space midclavicular line.
true
false
2. If a patient is experiencing fluid overload, what physiological
mechanism would likely contribute to an increase in their heart rate?
Vasopressor response
Bainbridge reflex
Cushing reflex
Baroreceptor reflex
3. Based on the diagram of the cardiac conduction system, which structure
is responsible for initiating the electrical impulse of the heart?
SA node
AV node
, Purkinje fibers
4. Your dehydrated patient has a sudden drop in BP. What is activated
immediately?
sympathetic nervous system by baroreceptors
pressure naturesis by the kidneys
sodium retention by aldosterone
water retention by ADH
5. Describe the significance of the base of the heart in relation to its
anatomical position.
The base of the heart is the primary site for gas exchange.
The base of the heart is where electrical signals originate.
The base of the heart is important for pumping blood to the
lungs.
The base of the heart is significant as it serves as the
attachment point for major blood vessels and is located at the
level of the 2nd intercostal space.
6. The heart lies in the following location
To the right of the midline of the thoracic cavity
In the pleural cavity
In the upper part of the thoracic cavity
To the left of the midline of the thoracic cavity
7. Describe the relationship between heart rate and the QT interval in
terms of cardiac physiology.
, The QT interval is only affected by the sympathetic nervous
system.
As heart rate increases, the QT interval decreases, indicating a
faster electrical conduction through the heart.
As heart rate increases, the QT interval increases, indicating
slower conduction.
8. What is the QT interval at a heart rate of 60 bpm according to the
provided formula?
0.38 seconds
0.42 seconds
0.44 seconds
0.40 seconds
9. What is the primary function of the SA node in the heart?
Filters blood
Pacemaker of the heart
Stimulates ventricular contraction
Regulates blood pressure
10. Describe the significance of all valves being closed during
isovolumetric ventricular relaxation.
All valves being closed allows the atria to fill with blood.
All valves being closed prevents the heart from contracting.
All valves being closed prevents blood from entering or
leaving the ventricles, allowing for pressure changes without
volume change.
2025/2026 WITH 100% ACCURATE ANSWERS
1. The base of the heart is up by the 2nd intercostal space and the apex of
the heart is at the 5th intercostal space midclavicular line.
true
false
2. If a patient is experiencing fluid overload, what physiological
mechanism would likely contribute to an increase in their heart rate?
Vasopressor response
Bainbridge reflex
Cushing reflex
Baroreceptor reflex
3. Based on the diagram of the cardiac conduction system, which structure
is responsible for initiating the electrical impulse of the heart?
SA node
AV node
, Purkinje fibers
4. Your dehydrated patient has a sudden drop in BP. What is activated
immediately?
sympathetic nervous system by baroreceptors
pressure naturesis by the kidneys
sodium retention by aldosterone
water retention by ADH
5. Describe the significance of the base of the heart in relation to its
anatomical position.
The base of the heart is the primary site for gas exchange.
The base of the heart is where electrical signals originate.
The base of the heart is important for pumping blood to the
lungs.
The base of the heart is significant as it serves as the
attachment point for major blood vessels and is located at the
level of the 2nd intercostal space.
6. The heart lies in the following location
To the right of the midline of the thoracic cavity
In the pleural cavity
In the upper part of the thoracic cavity
To the left of the midline of the thoracic cavity
7. Describe the relationship between heart rate and the QT interval in
terms of cardiac physiology.
, The QT interval is only affected by the sympathetic nervous
system.
As heart rate increases, the QT interval decreases, indicating a
faster electrical conduction through the heart.
As heart rate increases, the QT interval increases, indicating
slower conduction.
8. What is the QT interval at a heart rate of 60 bpm according to the
provided formula?
0.38 seconds
0.42 seconds
0.44 seconds
0.40 seconds
9. What is the primary function of the SA node in the heart?
Filters blood
Pacemaker of the heart
Stimulates ventricular contraction
Regulates blood pressure
10. Describe the significance of all valves being closed during
isovolumetric ventricular relaxation.
All valves being closed allows the atria to fill with blood.
All valves being closed prevents the heart from contracting.
All valves being closed prevents blood from entering or
leaving the ventricles, allowing for pressure changes without
volume change.
