Ch. 18 Module 4: Section 18.04-18.05 Dynamic Study Module

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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


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