Share The Heart
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What is the correct sequence of electrical current flow through the heart wall?
SA node, AV node, AV bundle, right and left bundle branches, subendocardial conducting network
The absolute refractory period refers to the time during which __________.
the muscle cell will not respond to a stimulus of any strength
The coronary arteries arise from the __________.
aorta
The structure just deep to the fibrous pericardium is the __________.
parietal layer of the serous pericardium
The normal pacemaker of the heart is the __________.
SA node
When the mitral valve closes, it prevents the backflow of blood from the __________.
left ventricle into the left atrium
The contractile cardiac muscle fibers of the myocardium behave as a single, coordinated unit called a __________.
functional syncytium
The noncontractile cardiac muscle cells that initiate their own depolarization and cause depolarization of the rest of the heart are called __________.
pacemaker cells
What part of the heart is considered the systemic circuit pump?
the left ventricle
The __________ are attached to the AV valve flaps.
chordae tendineae
Which valve is most often faulty in the heart?
the mitral, or bicuspid, valve
What factor gives the myocardium its high resistance to fatigue?
a very large number of mitochondria in the cytoplasm
The __________ nerve carries parasympathetic fibers to the sinoatrial (SA) node.
vagus
The inferior vena cava brings blood from the lower regions of the body and empties into the __________.
right atrium
From the perspective of blood returning from the systemic circuit, identify the correct sequence of blood flow through the chambers of the heart.
right atrium, right ventricle, lungs, left atrium, left ventricle
The lining of the heart chambers is called the __________.
endocardium
