hsb heart and cardiac cycle

what is the structure labelled 1

• pulmonary veins

• aorta

• anterior vena cava vein

• posterior vena cava vein

the chambers labeled 6 and 12 are

• atria

• septum

• ventricle

• semilunar valves

the chambers labeled 9 and 2 are

the structure labeled 5 and 11 are

deoxygenated blood enters which side of the heart

deoxygenated blood exits the heart via

oxygenated blood enters the body via

• aorta

• posterior vena cava vein

• anterior vena cava vein

• pulmonary vein

during diastole and atrial systole the ________ valves are open

• tricuspid valves

• semilunar valves

• bicuspid valves

• lunar vaves

the values of the heart are important in

• preventing back flow of blood

• allowing back flow of blood

• doing nothing

• staying open always

what stage of the cardiac cycle is being shown