Cardiac Cycle and Conduction System

The phase of the cardiac cycle in which the blood first enters the heart is called

• Diastole

• Atrial Systole

• Ventricular Systole

When the Atrial Diastole is occurring, which of the following are true

• AV Valves are opened

• Pressure in the atria increases

• The atria are relaxed

• SL Valves are closed

Atrial Diastole lasts for...

• 0.3seconds

• 0.1seconds

• 0.4seconds

• 1 second

The end of atrial diastole is signaled when...

• The AV node sends and impulse

• The purkinje fibres receive an impulse

• The SA node sends an impulse

• all the blood has left the atria

The SA Node sends and impulse to the...

• AV Valves

• Bundle of His

• Purkinje Fibres

• AV node

Atrial Systole happens when...

• The AV node receives a signal

• The atria relax

• The remaining blood moves from the atria to the ventricles

• The AV Valves are open

• The atria contract

Ventricular Systole begins when...

• The impulse is sent from the AV node to the SA Node

• The impulse is sent from the AV node to the Bundle of His

• The impulse is sent from the AV node to the Bundle of His and Purkinje Fibres

• The impulse is sent from the SA Node to the AV Node

During Ventricular Systole....

• The SL Valves Open

• The SL Valves Close

• The Ventricles contract

• The AV Valves Close

Once the electrical impulse finishes...

• Diastole begins

• The atria and ventricles relax

• The atria and ventricles contract

The amount of blood that leaves the heart in 1 contraction is called...

• Heart Rate

• Stroke Volume

• Cardiac Output