Ch. 18 Module 4: Section 18.04-18.05 Dynamic Study Module
Identify the part of the cardiac conduction system indicated by "A."
SA node
Match the following term with its correct description: Faster depolarizing pacemaker cells.
SA node
The normal pacemaker of the heart is the __________.
SA node
Choose the correct sequence of current flow through the heart wall.
SA node, AV node, AV bundle, right and left bundle branches, Purkinje fibers
Match the following term with its correct description: Conduction system cells that delay the impulse for about 0.1 second.
AV node
Match the following term with its correct description: Ventricular repolarization.
T wave
Match the given term with its correct description: Ventricular depolarization.
QRS complex
The P wave of an electrocardiogram represents __________.
atrial depolarization
The ability of some cardiac muscle cells to initiate their own depolarization and cause depolarization of the rest of the heart is called __________.
automaticity
The __________ nerve carries parasympathetic fibers to the sinoatrial (SA) node.
vagus
Identify the part of the cardiac conduction system indicated by "B."
AV node
Identify the part of the cardiac conduction system indicated by "D."
AV bundle (bundle of His)
Identify the part of the ECG indicated by "A."
Atrial depolarization
Identify the parts of the cardiac conduction system indicated by "E."
Bundle branches
dentify the parts of the cardiac conduction system indicated by "E."
Bundle branches
Match the following term to its correct description: Systole.
Contraction
Identify the parts of the cardiac conduction system indicated by "C."
Purkinje fibers
Which of the following factors gives the myocardium its high resistance to fatigue?
Large mitochondria in the cytoplasm
Match the following term with its correct description: Atrial depolarization.
P wave
Which of the following is a difference between cardiac muscle and skeletal muscle?
Unlike skeletal muscle cells, cardiac muscle have gap junctions between cells (that allow them to be autorhythmic).
Identify the part of the ECG indicated by "B."
Ventricular depolarization
Identify the part of the ECG indicated by "C."
Ventricular repolarization
The cells of the myocardium behave as a single, coordinated unit called a __________.
functional syncytium
The role of the atrioventricular node (AV node) is to __________.
slow down impulses so that the atria can contract to fill the adjacent ventricles with blood
The absolute refractory period refers to the time during which __________.
the muscle cell is not in a position to respond to a stimulus of any strength
