Heart Valve Worksheet

In the electrocardiogram/phonocardiogram below, the 1st sound – lub – is heard to what event taking place?

• pectinate muscle contraction

• SL valve closure

• AV valve closure

• Chordae tendinae detachment

Refer to the diagram of the heart and the electrical signal pathway. What is the function of the SA node?

• It pumps blood to the lungs

• It initiates the electrical signal that controls the heartbeat

• It receives oxygenated blood from the lungs

• It closes the heart valves

Refer to the diagram of the heart. The electrical signal pathway starts at the _________?

• SA node

• AV node

• Bundle of His

• Purkinje fibers

Refer to the Normal EKG graph. What does the EKG measure?

• Blood pressure

• Electrical activity of the heart

• Oxygen levels in the blood

• Heart valve function

The P wave corresponds with .

• ventricular repolarization

• atrial repolarization

• atrial depolarization
• ventricular depolarization

Which part of the heart is responsible for initiating the electrical signal?

• A) Atria

• B) SA node

• C) Ventricle

• D) Electrical signal pathway

Refer to the diagram of the heart labeled 'Electrocardiogram (EKG)'. The electrical signal travels through the ________ to coordinate the heartbeat.

• Electrical signal pathway

• Pulmonary artery

• Left ventricle

• Aortic valve

Refer to the graph labeled 'Normal EKG'. What does the EKG measure?

• Blood pressure

• Electrical activity of the heart

• Oxygen level in blood

• Heart size

The T wave corresponds with _________________ .

• ventricular repolarization

• ventricular depolarization

• atrial repolarization

• atrial depolarization

The ___________ initiates the electrical signal that causes the atria to contract.

• sinoatrial (SA) node

• atrioventricular (AV) node

• bundle of His

• Purkinje fibers