What is structure C

• SA node

• AV node

• Purkinje fibers

• Bundle of His

What valve prevents the back flow of blood from the left atrium?

• Pulmonary semilunar valve

• Aortic semilunar valve

• Tricuspid valve

• Bicuspid valve

#6

• Tricuspid valve

• Bicuspid vavle

• Pulmonary semilunar valve

• Aortic semilunar valve

• Left pulmonary vein

#12

• Tricuspid valve

• Bicuspid vavle

• Pulmonary semilunar valve

• Aortic semilunar valve

• Left pulmonary vein

Tags

NGSS.MS-LS1-3

The pulmonary circuit pumps blood to the

• Lungs

• Body

What structures returns blood from the lower half of the body to the heart?

• Superior vena cava

• Inferior vena cava

• Aorta

• Pulmonary artery

Blood entering the pulmonary artery is

• Oxygenated

• Deoxygenated

Systole is

• Ventricle contraction

• Ventricle relaxation

• Atrial contraction

• Atrial relaxation

What is structure D

• SA node

• AV node

• Purkinje fibers

• Bundle of His

What returns the deoxygenated blood to the right atrium from the heart muscle?

• Coronary arteries

• Coronary sinus

• Aorta

• Superior vena cava