Heart Practice Exam Questions Correctly Answered.
During the period of ventricular filling ________. - CORRECT ANSWER blood flows mostly passively through the atria and the open AV valves into the ventricles
If we were able to artificially alter the membrane permeability of pacemaker cells s...
Heart Practice Exam Questions
Correctly Answered.
During the period of ventricular filling ________. - CORRECT ANSWER blood flows mostly passively
through the atria and the open AV valves into the ventricles
If we were able to artificially alter the membrane permeability of pacemaker cells so that sodium influx
is more rapid, ________. - CORRECT ANSWER threshold is reached more quickly and heart rate would
increase
At what point in the cardiac cycle is pressure in the ventricles the highest (around 120 mm Hg)? -
CORRECT ANSWER ventricular systole
A patient was admitted to the hospital with chest pains. On admission, his pulse was 110 and blood
pressure was 96/64. According to his history, his normal pulse rate is usually between 80 and 88 and his
blood pressure runs from 120/70 to 130/80. Why did these changes in BP and HR occur? - CORRECT
ANSWER To maintain the same cardiac output, the heart rate would need to increase to compensate for
a decreased stroke volume.
The second heart sound is heard during which phase of the cardiac cycle? - CORRECT ANSWER
isovolumetric relaxation
What is the source of ATP for cardiac muscle contraction? - CORRECT ANSWER cellular respiration
The role of the coronary arteries is to __________. - CORRECT ANSWER supply blood to the heart tissue
How long is the cardiac cycle, assuming the heart beats 75 times per minute? - CORRECT ANSWER 0.8
seconds
Cardiac tamponade results in ineffective pumping of blood by the heart because the excessive amount
of fluid in the pericardial cavity will______. - CORRECT ANSWER prevent the heart from filling properly
with blood
, Which functional feature best describes the manner in which cardiac muscle contracts? - CORRECT
ANSWER Automaticity (autorhythmicity) promotes the spontaneous contraction of the cardiac muscle
cells.
What causes normal heart sounds? - CORRECT ANSWER heart valve closure
Which chamber of the heart receives oxygenated blood via the pulmonary circuit? - CORRECT ANSWER
left atrium
Norepinephrine acts on the heart by ________. - CORRECT ANSWER causing threshold to be reached
more quickly
The presence of an incompetent tricuspid valve would have the direct effect of causing ______. -
CORRECT ANSWER reduced efficiency in the delivery of blood to the lungs
Which portion of the electrocardiogram represents the depolarization wave received from the sinoatrial
(SA) node through the atria? - CORRECT ANSWER P wave
An older woman complains of shortness of breath and intermittent fainting spells. Her doctor runs
various tests and finds that the AV node is not functioning properly. What is the suggested treatment? -
CORRECT ANSWER Surgery to implant an artificial pacemaker
Damage to the ________ is referred to as heart block. - CORRECT ANSWER AV node
Action potentials generated by the autorhythmic cells spread to the contractile cells through what
structures in the membrane? - CORRECT ANSWER gap junctions
One of the changes that occurs in the pacemaker potential (unstable resting membrane potential) in the
SA node (an autorhythmic cell) is a decreased efflux of what ion? - CORRECT ANSWER potassium
When threshold is reached at the SA node (an autorhythmic cell), what channels open causing further
depolarization of the membrane? - CORRECT ANSWER fast calcium
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