The Cardiac Cycle Phase 1 - Atrial Systole Made EASY!!

This video delves into the cardiac cycle, focusing on atrial systole. It explains the role of the SA node in initiating atrial contraction, the resulting pressure changes, and the movement of blood into the ventricles. The concept of end diastolic volume is introduced, setting the stage for understanding stroke volume in future videos.

What is the primary focus of the cardiac cycle as introduced in the video?

• The process of blood clotting

• The sequence of events in a heartbeat

• The function of the lungs

• The role of the nervous system

What does the P wave in an electrocardiogram represent?

• Heart relaxation

• Atrial depolarization

• Ventricular contraction

• Blood pressure increase

Where is the SA node located?

• In the right ventricle

• In the left ventricle

• In the right atrium

• In the left atrium

What happens to the pressure in the atria when they contract?

• It fluctuates

• It remains the same

• It decreases

• It increases

What is the function of the atrioventricular valves?

• To prevent blood from entering the lungs

• To control blood pressure

• To regulate heart rate

• To allow blood to flow from the atria to the ventricles

What is the end diastolic volume?

• The total blood volume in the body

• The blood pressure during systole

• The amount of blood in the ventricles after relaxation

• The amount of blood in the atria after contraction

What phase follows atrial systole in the cardiac cycle?

• Ventricular systole

• Isovolumetric ventricular contraction

• Ventricular diastole

• Atrial diastole