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Bio 169 Exam prep 2024. 100 Questions and Correct Answers. 100% Correct.
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Bio 169 Exam prep 2024. 100 Questionsand Correct Answers. 100% Correct.
papillary muscles
extend from the endocardium of both ventricles and are attached to the cusps of the right and left valves
right bundle branch
is a bifurcation of conduction myofibrils at the interventricular septum that distributes the impulses from
the AV bundle to the right ventricle
Atrial Tachycardia
arrhythmia that usually has a rate between 150-250 bpm and consist of rapid heart rates that result from
a regular succession of ectopic beats in the atria or from a reentry pathway within the AV node
An electrocardiogram is a surface measurement of the electrical potential generated by electrical activity
in
purkinge fibers
the heart comprises_______% of the body weight and uses ______% of the body's oxygen
.5%; 5%
the ________ returns 20% of the coronary circuit venous return to the __________
small coronary veins; right ventricle
the ________ valve prevents backflow from the RV into the RA during RV _______
tricuspid; systole
specialized muscle structures in the ventricles called ____________ contribute to the structure of the
chambers
trabeculae carnae
the epicardium and the parietal pericardium secrete ___________ fluid into the ___________ sac
serous; pericardial
the LAV along with the RAV form the _________ heart sound known as __________
first; lubb
NSR is the abbreviation for
normal sinus rhythm
, composed of auto-rhythmic cells located at the junction of the four chambers of the heart, this acts as
the secondary pacemaker_________
atrio-ventricular node
the ______ wave is the first positive deflection that represents atrial _________ as it spreads from the
_____ node and across both atria
P; depolarization; SA
known as the flat line or asystole, this point denotes neither a negative nor positive deflection
isoelectric trace line
the period when all heart muscle of the chambers is at rest is known as the
quiescent
this interval represents the time it takes for ventricular depolarization to occur
QRS interval
the equilateral triangle that represents the three lead EKG is called
Einthoven's triangle
a 12 lead EKG views the heart from ________ angles and a 3 or 5 lead EKG views it from _________ to
___________ angles
12; 1; 3
electrode _________ on a 3 lead EKG establishes a common ground for the body and the
electrocardiograph
three
the word ________ is defined as an enlarged heart
cardiomegaly
a constant twitching at a rate so high that true heartbeats do not occur is known as
fibrillation
in a ________ block, only one of every two impulses from the SA node makes it through the AV node to
the ventricles
2:1
the zone of cardiac muscle death where action potentials cannot be generated is known as the
ischemic zone
when the atria contract more frequently than the ventricles it is known as
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