Cardiac Cycle and Conduction

What are the phases of the cardiac cycle?

• Contraction and relaxation

• Inhale and exhale

• Expansion and compression

• Diastole and systole

Which phase of the cardiac cycle is known as the relaxation phase?

• Diastole

• Systole

• Ventricular contraction

• Atrial contraction

During which phase of the cardiac cycle does the ventricle contract and blood is pumped out of the heart?

• Systole

• Atrial contraction

• Relaxation phase

• Diastole

What is the role of the SA node in the electrical conduction of the heart?

• Regulating blood pressure

• Producing red blood cells

• Stimulating muscle growth

• Initiating the electrical impulse for each heartbeat

Which part of the heart is responsible for initiating the electrical impulse that causes the heart to beat?

• Left ventricle

• Pulmonary artery

• Aorta

• SA node

What is the function of the AV node in the conduction system of the heart?

• To regulate the blood pressure in the heart

• To delay the electrical impulse and allow the atria to fully contract before the ventricles are stimulated.

• To speed up the electrical impulse and cause the ventricles to contract before the atria

• To stop the electrical impulse and prevent the heart from beating

What is the term for the time delay between the atrial and ventricular contractions in the heart?

• AV delay

• Heartbeat lag

• Atrial delay

• Ventricular delay

How does the sympathetic nervous system affect the conduction of the heart?

• Decreases heart rate and conduction velocity

• Has no effect on heart rate or conduction velocity

• Increases heart rate and conduction velocity

• Causes irregular heartbeats and slow conduction