WorksheetsHeartbeat (Unit 5 Standard B)
Total questions: 10
Worksheet time: 12mins
Which portion of the EKG corresponds to the repolarization of the atria?
T wave
QRS Complex
P wave
None of the above. Atrial repolarization is masked by ventricular depolarization
Where is the sinoatrial (SA) node located in the heart?
The junction between the atria and ventricles
The wall of the right atrium
To the right of the inferior vena cava
At the base of the ventricles
Which term refers to the stage of ventricular systole when the volumes of the ventricles are not changing (e.g. no blood is being ejected) but pressure is still rising?
End-diastolic volume
Diastole
Quiescent
Isovolumic contraction
Blood enters the ventricle passively during ________.
atrial systole
ventricular diastole
ventricular systole
isovolumic contraction
The first heart sound represents which portion of the cardiac cycle?
opening of the atrioventricular valves
closing of the semilunar valves
closing of the atrioventricular valves
closing of the semilunar valves
Which structure of the heart is known as the cardiac pacemaker or the natural pacemaker?
The atrioventricular (AV) node
The sinoatrial (SA) node
The Purkinje fibers
The bundle branches
Which of the following is not a stage of the action potential in cardiac muscles?
Initial Closure
Rapid Depolarization
Plateau
Repolarization
The ventricles begin contracting shortly after the peak of the
R wave
T wave
P wave
Qa wave
As ventricular pressure rises and exceeds pressure in the arteries, what occurs?
Ventricles relax
Semilunar valves close
Semilunar valves open
Atria relax
Purkinje fibers radiate from the apex towards the base of the heart. As a result, ventricles contract in a wave to push blood ________.
The ventricles
The pulmonary veins
The atria
The pulmonary trunk and aorta
