ECG Basics Quiz

The PR interval is usually

• 0.06- 0.10 second

• 0.12- 0.20 second

• > 0.20 second

• <0.06 second

What part of the ECG tracing represents the repolarization of the Purkinje fibers?

• T wave

• PR interval

• U wave

• P wave

What part of the ECG tracing represents the time from the start of the atrial activity to the start of ventricular activity?

• QRS complex

• J point

• QT interval

• PR interval

What part of the ECG tracing is measured from end of the S wave to the beginning of the T wave and is normally on the isoelectric line?

• ST segment

• QT segment

• U wave

• QRS somplex

What wave on the ECG tracing is not always seen sometimes, but, when seen, can indicate an electrolyte imbalance?

• U wave

• P wave

• Q wave

• R wave

The heart's ability to create its own electrical impulse is known as:

• conductivity

• contractility

• automaticity

• excitability

When stimulated, the sympathetic system of the body causes the heart rate to:

• increase

• decrease

• remain the same

• increase, then decrease

Which vessel of the body contains the highest concentration of oxygen?

• Aorta

• Pulmonary artery

• Superior vena cava

• Inferior vena cava

The heart is contained inside a structure also known as the:

• endocardium

• pericardial sac

• myocardium sac

• fluid sac

Which of the following would most likely increase the heart rate?

• stress, exercise, and fever

• high concentration of potassium in the blood

• decreased respirations

• increased blood pressure