What is structure P called?

• Pulmonary vein

• Aorta

• Vena Cava

• Pulmonary artery

What is structure S called?

• Left ventricle

• Aorta

• Aortic valve

• Pulmonary artery

What is structure R called?

• Left ventricle

• Aorta

• Aortic valve

• Pulmonary artery

Which structures of the heart prevents the backflow of blood?

Why does the wall of S have thick muscular walls?

• because it pumps blood under low pressure

• because it has to pump blood to further parts of the body

• because it only has to pump blood to the lungs?

• because its on the left side

The right side of the heart contains ___________ type of blood.

The term we use to mean that the heart is able to initiate its own contraction is ________.

During which phase of the cardiac cycle is this?:

All chambers of the heart are relaxed

• Atrial systole

• Ventricular systole

• Diastole

During which phase of the cardiac cycle is this?:

Pulmonary and aortic valves closed as blood is pumped into the ventricles

• Atrial systole

• Ventricular systole

• Diastole

During which phase of the cardiac cycle is this?:

Ventricles contract and push blood into the arteries

• Atrial systole

• Ventricular systole

• Diastole