Electrocardiogram (EKG)

What does an Electrocardiogram (ECG/EKG) record?

• Blood pressure levels

• Electrical impulses in the heart

• Oxygen levels in the blood

• Heart sounds

What is considered the pacemaker of the heart?

• Atrioventricular node

• Atria

• Sinoatrial node

• Ventricles

What does the SA node generate to signal the heart to contract?

• Hormonal signal

• Mechanical signal

• Electrical signal

• Thermal signal

Tags

NGSS.HS-LS1-3

Which part of the heart contracts following the signal from the SA node?

• Ventricles

• Atrioventricular node

• Atria

• Arteries

What does the AV node do after receiving the signal from the SA node?

• It sends a signal to the atria to contract.

• It sends a signal to the lungs to absorb oxygen.

• It contracts the ventricles and pumps blood.

• It relaxes the heart muscles.

What is the name of the structure labeled in the diagram that initiates the heartbeat?

• Ventricles

• Atria

• Sinoatrial node

• Aorta

An ECG or EKG can be used to determine if a person:

• Has a viral infection

• Is experiencing a heart attack or has coronary artery disease

• Needs a kidney transplant

• Has a headache

What does the P wave on an EKG represent?

• Repolarization of ventricles

• Depolarization of atria, where heart contractions start

• Depolarization of ventricles

• Heart at rest or recovering after beating

What is indicated by the QRS complex on an EKG?

• Repolarization of ventricles

• Depolarization of atria, where heart contractions start

• Depolarization of ventricles

• Heart at rest or recovering after beating

What does the T wave on an EKG signify?

• Repolarization of ventricles

• Depolarization of atria, where heart contractions start

• Depolarization of ventricles

• Beginning of atrial ventricular contractions