Cardiac Physiology Study Questions
(select the single
The left side of the heart pumps blood to the lungs, the right side of the heart pumps
blood to the rest of the body.
Blood in the left atrium enters the left ventricle through the
A) pulmonary semilunar
C) bicuspid (mitral)
D) aortic semilunar
The plateau of the cardiac action potential is caused by an increase in the permeability
of which of the following?
D) B and C
E) A, B, and C
The heart’s conduction system is specialized nerve cells.
Which of the following is the sequence of excitation in a normal heart?
SA node, AV node, atrial myocardium, bundle of His, Purkinje fibers, ventricular
B) SA node, atrial myocardium, AV node, bundle of His, ventricular
myocardium, Purkinje fibers
C) SA node, atrial myocardium, ventricular myocardium, AV
node, bundle of His, Purkinje fibers
D) SA node, atrial myocardium, AV node, bundle of
His, Purkinje fibers, ventricular myocardium
If the SA node is damaged, and the AV node becomes the pacemaker of the heart,
heart rate will most likely
A) stay the same
The atrial syncytium is separated from the ventricular syncytium by the heart’s fibrous
skeleton except at the ________ (also called the “link to the ventricles”).
A) SA node
B) bundle of His
C) Purkinje fibers
D) AV node
Sympathetic impulses decrease the slope of the pacemaker potential.
In complete heart block, there is no correlation between
A) QRS complexes and T waves
B) P waves and QRS complexes
C) both A and B
D) neither A nor B
10. Which of the following is an uncoordinated contraction in which small areas of the
myocardium contract and relax independently (and the myocardial cells fail to contract
11. Which of the following causes the atrioventricular (AV) valves to close?
A) ventricular pressure less than aortic pressure
B) atrial pressure greater than ventricular
C) ventricular pressure greater than atrial pressure
D) relaxation of the ventricles
Stroke volume is
A) end diastolic volume + end systolic volume
B) end diastolic
volume – end systolic volume
C) end systolic volume – end diastolic volume
D) end systolic volume x end diastolic volume
E) equal to end diastolic volume
13. The cardiac cycle for the right side of the heart is different than the cardiac cycle for
the left side of the heart because
A) the right side of the heart generates lower pressures
B) the right side of the heart is thicker
C) the right side of the heart generates higher