CV System

This structure prevents blood from flowing back into the atria when the ventricles contract.

• semilunar valve

• pulmonary and aortic valves

• Tricuspid and bicuspid valves

• coronary sinus

The chamber in the heart that receives oxygenated blood from the lungs is

• right atrium

• right ventricle

• left atrium

• left ventricle

When blood leaves this chamber of the heart, it heads out to the systemic circulation.

• right atrium

• right ventricle

• left atrium

• left ventricle

This blood vessel splits in two and sends oxygen-poor blood to the lungs.

• aorta

• pulmonary trunk

• inferior vena cava

• superior vena cava

This structure is responsible for distributing electrical impulses through the heart.

• SA node

• AV node

• bundle branches

• Purkinje fibers

One of the body's largest blood vessels that transports blood from the body region below the diaphragm to the heart.

• superior vena cava

• inferior vena cava

• aorta

• pulmonary vein

Stops blood flow back into the ventricles each time they contract.

• tricuspid valve

• bicuspid valve

• semilunar valves

• mitral valve

When this chamber contracts, it pushes blood through the tricuspid valve.

• right atrium

• right ventricle

• left atrium

• left ventricle

When blood leaves this chamber of the heart, it heads to the lungs.

• right atrium

• right ventricle

• left atrium

• left ventricle

___ are the smallest blood vessels with the ____ walls.

• arterioles/thinnest

• capillaries; thickest

• capillaries; thinnest

• arterioles; thickest