Physio Lab – Heart Question and
answers correctly solved 2025
Which of the following represents the time it takes for the ventricles to contract
and recover, or repolarize? - correct answer Q-T interval
Depolarization of a myocardial contractile cell occurs as the result of a: -
correct answer Rapid movement of sodium into the cell
There is less laminar flow of blood in a vessel with a smaller radius due to
friction. - correct answer True
Atrial repolarization is not seen as a separate wave on the ECG. - correct
answer True
The sympathetic nervous system influences the rate of depolarization of the
SA node. - correct answer True
The second heart sound results from vibrations generated by the: - correct
answer Closing of the semilunar valves at the start of diastole
The production and conduction of action potentials in the heart produces a
recordable tracing of the electrical activity of the heart called a(n): - correct
answer ECG
The pacemaker of the heart is the AV node. - correct answer False
, Doubling the viscosity of the blood would have more of an affect on peripheral
resistance than doubling the diameter of the blood vessel. - correct answer
False
The T wave in an ECG reflects: - correct answer Ventricle repolarization
Which of the following will increase flow in a vessel the most? - correct answer
Increase radius by 1 unit
How many limb leads are in a standard ECG?6 - correct answer
How does the body decrease the blood vessel radius? - correct answer
Vasoconstriction
Tetanic contractions in cardiac muscle do not occur due to the long absolute
refractory period. - correct answer True
In an electrocardiogram, if a wave of depolarization moves away from a
postive electrode, the ECG tracing shows a(n) __________ deflection -
correct answer Downward
The purpose of having valves in the cardiovascular system is to: - correct
answer Ensure that blood flows in one direction
During the plateau phase of myocardial cell action potentials, the main
electrolyte that is slowly moving into the cell is: - correct answer Calcium
Where is the sinoatrial node located? - correct answer Near the entrance of
the superior vena cava in the right atrium
answers correctly solved 2025
Which of the following represents the time it takes for the ventricles to contract
and recover, or repolarize? - correct answer Q-T interval
Depolarization of a myocardial contractile cell occurs as the result of a: -
correct answer Rapid movement of sodium into the cell
There is less laminar flow of blood in a vessel with a smaller radius due to
friction. - correct answer True
Atrial repolarization is not seen as a separate wave on the ECG. - correct
answer True
The sympathetic nervous system influences the rate of depolarization of the
SA node. - correct answer True
The second heart sound results from vibrations generated by the: - correct
answer Closing of the semilunar valves at the start of diastole
The production and conduction of action potentials in the heart produces a
recordable tracing of the electrical activity of the heart called a(n): - correct
answer ECG
The pacemaker of the heart is the AV node. - correct answer False
, Doubling the viscosity of the blood would have more of an affect on peripheral
resistance than doubling the diameter of the blood vessel. - correct answer
False
The T wave in an ECG reflects: - correct answer Ventricle repolarization
Which of the following will increase flow in a vessel the most? - correct answer
Increase radius by 1 unit
How many limb leads are in a standard ECG?6 - correct answer
How does the body decrease the blood vessel radius? - correct answer
Vasoconstriction
Tetanic contractions in cardiac muscle do not occur due to the long absolute
refractory period. - correct answer True
In an electrocardiogram, if a wave of depolarization moves away from a
postive electrode, the ECG tracing shows a(n) __________ deflection -
correct answer Downward
The purpose of having valves in the cardiovascular system is to: - correct
answer Ensure that blood flows in one direction
During the plateau phase of myocardial cell action potentials, the main
electrolyte that is slowly moving into the cell is: - correct answer Calcium
Where is the sinoatrial node located? - correct answer Near the entrance of
the superior vena cava in the right atrium
