Lesson 13 - Atrial Fibrillation
Due Apr 21 at 11:59pm Points 31 Questions 31
Available Mar 18 at 12am - Apr 21 at 11:59pm about 1 month Time Limit None
Attempt History
Attempt Time Score
LATEST Attempt 1 1,070 minutes 4.14 out of 31 *
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Score for this quiz: 4.14 out of 31 *
Submitted Apr 21 at 4:54 pm
This attempt took 1,070 minutes.
Question 1 Not yet graded / 1 pts
Exercise 1 - Writing Activity
This exercise will take approximately 20 minutes to complete.
Exercise 1 - Question 1
Describe the normal conduction system of the heart.
Your Answer:
The cardiac conduction system is a group of specialized cardiac muscle
cells in the walls of the heart that send signals to the heart muscle
causing it to contract. The main components of the cardiac conduction
system are the SA node, AV node, bundle of His, bundle branches, and
Purkinje fibers
The conduction system begins with the sinoatrial (SA) node,
located close to the surface of the right atrium near its junction
with the superior vena cava. It is the heart’s primary
pacemaker, with an intrinsic rate of 60 to 100 beats per minute
(bpm). Impulses from the sinus node move directly through
atrial muscle and lead to atrial depolarization, reflected in a P
wave on the electrocardiogram (ECG). Atrial muscle
contraction should follow. The impulse travels via slow and fast
conduction pathways leading to the atrioventricular (AV) node,
located just beneath the right atrial endocardium, between the
tricuspid valve and the ostium of the coronary sinus. The
impulse is delayed here before proceeding to the ventricles.
This delay is reflected in the PR segment on the ECG. After the
delay, the impulse travels into the bundle of His, down the right
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and left bundle branches and into the terminal Purkinje fibers.
This leads to ventricular depolarization and contraction.
Question 2 Not yet graded / 1 pts
Exercise 1 - Question 2
What is "atrial kick"? Why is this important?
Your Answer:
It occurs during the late inflow portion of the cardiac cycle where blood
is moving from the left atrium to the left ventricle. The purpose of the
atrial kick is to increase the pressure gradient across the mitral valve
to allow more blood to be present in the LV at the end of diastole
Atrial kick, facilitated by a short delay in impulse conduction in
the AV node, occurs when the atria contract before the
ventricles. The atrial contraction contributes additional blood
volume for a greater cardiac output.
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