Structure of the Heart

The heart has ............ chambers.

• One

• Two

• Three

• Four

What prevents backflow of blood in each chamber?

• Valves

• Atrium

• Ventricle

• Pacemaker

Where does oxygen-poor blood from the body, enter the heart first?

• Valves

• Right Atrium

• Left Ventricle

• Left Atrium

Blood is pumped from the right ventricle into the ..........................

• Pulmonary artery

• Pulmonary vein

• Left Ventricle

• Left Atrium

Oxygen-rich blood returns to the heart through the pulmonary vein and enters the ............................

• Pulmonary artery

• Right Atrium

• Left Ventricle

• Left Atrium

When the ventricles contract, blood is pumped from the left ventricle into a large artery called the ............................

• Pulmonary artery

• Aorta

• Pulmonary vein

• Left Atrium