Atrioventricular valves separate the: right atrium from the left atrium and the right ventricle from the left ventricle. aorta from the left ventricle. right and left ventricles. left atrium from the left ventricle and the right atrium from the right ventricle.

Hello, fellow Brainlies!  The answer to the question that you have is:

Artioventricular valves separate the atria from the ventricles on EACH side of the heart and prevent backflow from the ventricles into the atria during systole.

Additional info:

They include the mitral and tricuspid valves.

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i think it's the first one because doctors aren't the ones who get rid of the old needles. most of them time it's not even doctors who give you shots, it's nurses.