Cardiac Cycle Quiz

What is the heartbeat controlled by?

• Mechanical force

• Electrical impulses

• Chemical reactions

• Manual operation

What is the function of the Sinoatrial (SA) Node in the heart?

• It regulates blood pressure.

• It causes the left and right atrium to contract.

• It filters the blood.

• It closes the heart valves.

What is the SA Node also known as?

• The heart's filter

• The heart's valve

• The heart's pacemaker

• The heart's ventricle

What is the function of the Atrioventricular (AV) node in controlling the heartbeat?

• It generates the initial electrical impulse.

• It increases the speed of the electrical impulse.

• It delays the electrical impulse to allow blood to move from the atria to the ventricles.

• It pumps blood out of the heart.

Where is the impulse passed after it leaves the AV node?

• Sinoatrial (SA) Node

• Ventricles

• Bundle of His

• Aorta

What is the purpose of the insulation of the Bundle of His fibers?

• To speed up the heart rate

• To ensure the ventricles contract at the right time

• To prevent the atria from contracting

• To reduce the heart's electrical conductivity

What is the function of the Purkinje fibres in the heart?

• They regulate the heartbeat by controlling the rhythm.

• They make the left and right ventricles contract.

• They pump blood into the heart.

• They carry oxygenated blood to the rest of the body.

Where do the ventricles contract from when the Purkinje fibres function?

• From the top of the heart.

• From the middle of the heart.

• From the bottom of the heart.

• From the outside of the heart.

What is the result of the ventricles contracting from the bottom of the heart?

• It squeezes blood down and out of the heart.

• It stops the blood from flowing.

• It squeezes blood up and out of the heart.

• It allows blood to flow back into the atria.

What is the name of the node that initiates the heartbeat?

• Atrioventricular (AV) Node

• Bundle of His

• Purkinje Fibres

• Sinoatrial (SA) Node