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BIO 202 RS Conduction Electrocardiogram practice material
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EKG and heart lab. practice material for A&P. *Essential!! *For you!!
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Page 1 of 6Conduction System and Electrocardiogram
The heart contains specialized cells that help transmit a signal across the heart. This contributes to a
cohesive contraction so that blood can efficiently pump throughout the body. If there are deficiencies
in these electrical conducting cells, certain chambers might not contract at the same time, when they
should, or they might not contract at all. An electrocardiogram (ECG) can be obtained from electrodes
that are placed on the chest that pick up the electricity flowing through the heart. It is easiest to think of
an ECG as a picture in time of an electrical event happening within the heart. If one or more of the struc-
tures are not normal in their appearance then a medical professional can clearly identify and manage
any symptoms or treatment for that individual.
Part A: Cardiac Conduction System
1. On the following image of the heart, label the relevant structures of the cardiac
conduction system.
Components:
SA Node | AV Node | Bundle of His (AV Bundle) | Right and Left Bundle Branches | Purkinje fibers
Sinotrial Node
HIS Bundle
Left Bundle Branch
Atrioventricular node
Right Bundle Branch
Purkinje Fibers
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, Page 2 of 6
2. Which structure of the conduction system starts the signal?
SA Node
a. What is another name for this structure?
Sinus Node
3. The right and left bundle branches travel down what structure within the heart?
The Bundle if HIS
4. In a normal functioning heart every time the SA node is depolarized there is a heartbeat. Suppose
someone has a heart rate of 80 beats per minute. How many times did the SA node depolarize in
that minute?
Depolarized 80 times
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